feat: add backend .NET project with Domain, Infrastructure, API, and CLI

src/ParagonPlayground/backend/.dockerignore

@@ -0,0 +1,8 @@
+**/.git/
+**/bin/
+**/obj/
+**/node_modules/
+**/appsettings.Development.json
+**/.dockerignore
+Dockerfile
+README.md

src/ParagonPlayground/backend/.editorconfig

@@ -0,0 +1,393 @@
+root = true
+
+# All files
+[*]
+indent_style = space
+
+# Xml files
+[*.xml]
+indent_size = 2
+
+# Xml project files
+[*.{csproj,fsproj,vbproj,proj,slnx}]
+indent_size = 2
+
+# Xml config files
+[*.{props,targets,config,nuspec}]
+indent_size = 2
+
+[*.json]
+indent_size = 2
+
+# C# files
+[*.cs]
+
+#### Core EditorConfig Options ####
+
+# Indentation and spacing
+indent_size = 2
+tab_width = 2
+
+# New line preferences
+insert_final_newline = false
+
+#### .NET Coding Conventions ####
+[*.{cs,vb}]
+
+# dotnet analyzer settings
+dotnet_diagnostic.IDE0100.severity = none
+dotnet_diagnostic.CA1822.severity = none
+
+# Organize usings
+dotnet_separate_import_directive_groups = true
+dotnet_sort_system_directives_first = true
+file_header_template = unset
+
+# this. and Me. preferences
+dotnet_style_qualification_for_event = false:silent
+dotnet_style_qualification_for_field = false:silent
+dotnet_style_qualification_for_method = false:silent
+dotnet_style_qualification_for_property = false:silent
+
+# Language keywords vs BCL types preferences
+dotnet_style_predefined_type_for_locals_parameters_members = true:silent
+dotnet_style_predefined_type_for_member_access = true:silent
+
+# Parentheses preferences
+dotnet_style_parentheses_in_arithmetic_binary_operators = always_for_clarity:silent
+dotnet_style_parentheses_in_other_binary_operators = always_for_clarity:silent
+dotnet_style_parentheses_in_other_operators = never_if_unnecessary:silent
+dotnet_style_parentheses_in_relational_binary_operators = always_for_clarity:silent
+
+# Modifier preferences
+dotnet_style_require_accessibility_modifiers = for_non_interface_members:silent
+
+# Expression-level preferences
+dotnet_style_coalesce_expression = true:suggestion
+dotnet_style_collection_initializer = true:suggestion
+dotnet_style_explicit_tuple_names = true:suggestion
+dotnet_style_namespace_match_folder = true:suggestion
+dotnet_style_null_propagation = true:suggestion
+dotnet_style_object_initializer = true:suggestion
+dotnet_style_operator_placement_when_wrapping = beginning_of_line
+dotnet_style_prefer_auto_properties = true:suggestion
+dotnet_style_prefer_collection_expression = when_types_loosely_match:suggestion
+dotnet_style_prefer_compound_assignment = true:suggestion
+dotnet_style_prefer_conditional_expression_over_assignment = true:suggestion
+dotnet_style_prefer_conditional_expression_over_return = false:silent
+dotnet_style_prefer_foreach_explicit_cast_in_source = when_strongly_typed:suggestion
+dotnet_style_prefer_inferred_anonymous_type_member_names = true:suggestion
+dotnet_style_prefer_inferred_tuple_names = true:suggestion
+dotnet_style_prefer_is_null_check_over_reference_equality_method = true:suggestion
+dotnet_style_prefer_simplified_boolean_expressions = true:suggestion
+dotnet_style_prefer_simplified_interpolation = true:suggestion
+
+# Field preferences
+dotnet_style_readonly_field = true:warning
+
+# Parameter preferences
+dotnet_code_quality_unused_parameters = all:suggestion
+
+# Suppression preferences
+dotnet_remove_unnecessary_suppression_exclusions = none
+
+#### C# Coding Conventions ####
+[*.cs]
+
+# var preferences
+csharp_style_var_elsewhere = true:suggestion
+csharp_style_var_for_built_in_types = true:suggestion
+csharp_style_var_when_type_is_apparent = true:suggestion
+
+# Expression-bodied members
+csharp_style_expression_bodied_accessors = true:silent
+csharp_style_expression_bodied_constructors = false:silent
+csharp_style_expression_bodied_indexers = true:silent
+csharp_style_expression_bodied_lambdas = false:silent
+csharp_style_expression_bodied_local_functions = false:silent
+csharp_style_expression_bodied_methods = false:silent
+csharp_style_expression_bodied_operators = false:silent
+csharp_style_expression_bodied_properties = true:silent
+
+# Pattern matching preferences
+csharp_style_pattern_matching_over_as_with_null_check = true:suggestion
+csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
+csharp_style_prefer_extended_property_pattern = true:suggestion
+csharp_style_prefer_not_pattern = true:suggestion
+csharp_style_prefer_pattern_matching = true:silent
+csharp_style_prefer_switch_expression = true:suggestion
+
+# Null-checking preferences
+csharp_style_conditional_delegate_call = true:suggestion
+
+# Modifier preferences
+csharp_prefer_static_anonymous_function = true:suggestion
+csharp_prefer_static_local_function = true:warning
+csharp_preferred_modifier_order = public,private,protected,internal,file,const,static,extern,new,virtual,abstract,sealed,override,readonly,unsafe,required,volatile,async:suggestion
+csharp_style_prefer_readonly_struct = true:suggestion
+csharp_style_prefer_readonly_struct_member = true:suggestion
+
+# Code-block preferences
+csharp_prefer_braces = true:silent
+csharp_prefer_simple_using_statement = true:suggestion
+csharp_style_namespace_declarations = file_scoped:suggestion
+csharp_style_prefer_method_group_conversion = true:silent
+csharp_style_prefer_primary_constructors = true:suggestion
+csharp_style_prefer_top_level_statements = true:silent
+
+# Expression-level preferences
+csharp_prefer_simple_default_expression = true:suggestion
+csharp_style_deconstructed_variable_declaration = true:suggestion
+csharp_style_implicit_object_creation_when_type_is_apparent = true:suggestion
+csharp_style_inlined_variable_declaration = true:suggestion
+csharp_style_prefer_index_operator = true:suggestion
+csharp_style_prefer_local_over_anonymous_function = true:suggestion
+csharp_style_prefer_null_check_over_type_check = true:suggestion
+csharp_style_prefer_range_operator = true:suggestion
+csharp_style_prefer_tuple_swap = true:suggestion
+csharp_style_prefer_utf8_string_literals = true:suggestion
+csharp_style_throw_expression = true:suggestion
+csharp_style_unused_value_assignment_preference = discard_variable:suggestion
+csharp_style_unused_value_expression_statement_preference = discard_variable:silent
+
+# 'using' directive preferences
+csharp_using_directive_placement = outside_namespace:silent
+
+#### C# Formatting Rules ####
+
+# New line preferences
+csharp_new_line_before_catch = true
+csharp_new_line_before_else = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_members_in_anonymous_types = true
+csharp_new_line_before_members_in_object_initializers = true
+csharp_new_line_before_open_brace = all
+csharp_new_line_between_query_expression_clauses = true
+
+# Indentation preferences
+csharp_indent_block_contents = true
+csharp_indent_braces = false
+csharp_indent_case_contents = true
+csharp_indent_case_contents_when_block = true
+csharp_indent_labels = one_less_than_current
+csharp_indent_switch_labels = true
+
+# Space preferences
+csharp_space_after_cast = false
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_space_after_comma = true
+csharp_space_after_dot = false
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_after_semicolon_in_for_statement = true
+csharp_space_around_binary_operators = before_and_after
+csharp_space_around_declaration_statements = false
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_before_comma = false
+csharp_space_before_dot = false
+csharp_space_before_open_square_brackets = false
+csharp_space_before_semicolon_in_for_statement = false
+csharp_space_between_empty_square_brackets = false
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
+csharp_space_between_method_call_name_and_opening_parenthesis = false
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
+csharp_space_between_method_declaration_name_and_open_parenthesis = false
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+csharp_space_between_parentheses = false
+csharp_space_between_square_brackets = false
+
+# Wrapping preferences
+csharp_preserve_single_line_blocks = true
+csharp_preserve_single_line_statements = true
+
+#### Naming styles ####
+[*.{cs,vb}]
+
+# Naming rules
+
+dotnet_naming_rule.types_and_namespaces_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.types_and_namespaces_should_be_pascalcase.symbols = types_and_namespaces
+dotnet_naming_rule.types_and_namespaces_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_rule.interfaces_should_be_ipascalcase.severity = suggestion
+dotnet_naming_rule.interfaces_should_be_ipascalcase.symbols = interfaces
+dotnet_naming_rule.interfaces_should_be_ipascalcase.style = ipascalcase
+
+dotnet_naming_rule.type_parameters_should_be_tpascalcase.severity = suggestion
+dotnet_naming_rule.type_parameters_should_be_tpascalcase.symbols = type_parameters
+dotnet_naming_rule.type_parameters_should_be_tpascalcase.style = tpascalcase
+
+dotnet_naming_rule.methods_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.methods_should_be_pascalcase.symbols = methods
+dotnet_naming_rule.methods_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_rule.properties_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.properties_should_be_pascalcase.symbols = properties
+dotnet_naming_rule.properties_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_rule.events_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.events_should_be_pascalcase.symbols = events
+dotnet_naming_rule.events_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_rule.local_variables_should_be_camelcase.severity = suggestion
+dotnet_naming_rule.local_variables_should_be_camelcase.symbols = local_variables
+dotnet_naming_rule.local_variables_should_be_camelcase.style = camelcase
+
+dotnet_naming_rule.local_constants_should_be_camelcase.severity = suggestion
+dotnet_naming_rule.local_constants_should_be_camelcase.symbols = local_constants
+dotnet_naming_rule.local_constants_should_be_camelcase.style = camelcase
+
+dotnet_naming_rule.parameters_should_be_camelcase.severity = suggestion
+dotnet_naming_rule.parameters_should_be_camelcase.symbols = parameters
+dotnet_naming_rule.parameters_should_be_camelcase.style = camelcase
+
+dotnet_naming_rule.public_fields_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.public_fields_should_be_pascalcase.symbols = public_fields
+dotnet_naming_rule.public_fields_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_rule.private_fields_should_be__camelcase.severity = suggestion
+dotnet_naming_rule.private_fields_should_be__camelcase.symbols = private_fields
+dotnet_naming_rule.private_fields_should_be__camelcase.style = _camelcase
+
+dotnet_naming_rule.private_static_fields_should_be_s_camelcase.severity = suggestion
+dotnet_naming_rule.private_static_fields_should_be_s_camelcase.symbols = private_static_fields
+dotnet_naming_rule.private_static_fields_should_be_s_camelcase.style = s_camelcase
+
+dotnet_naming_rule.public_constant_fields_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.public_constant_fields_should_be_pascalcase.symbols = public_constant_fields
+dotnet_naming_rule.public_constant_fields_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_rule.private_constant_fields_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.private_constant_fields_should_be_pascalcase.symbols = private_constant_fields
+dotnet_naming_rule.private_constant_fields_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_rule.public_static_readonly_fields_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.public_static_readonly_fields_should_be_pascalcase.symbols = public_static_readonly_fields
+dotnet_naming_rule.public_static_readonly_fields_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_rule.private_static_readonly_fields_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.private_static_readonly_fields_should_be_pascalcase.symbols = private_static_readonly_fields
+dotnet_naming_rule.private_static_readonly_fields_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_rule.enums_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.enums_should_be_pascalcase.symbols = enums
+dotnet_naming_rule.enums_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_rule.local_functions_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.local_functions_should_be_pascalcase.symbols = local_functions
+dotnet_naming_rule.local_functions_should_be_pascalcase.style = pascalcase
+
+dotnet_naming_rule.non_field_members_should_be_pascalcase.severity = suggestion
+dotnet_naming_rule.non_field_members_should_be_pascalcase.symbols = non_field_members
+dotnet_naming_rule.non_field_members_should_be_pascalcase.style = pascalcase
+
+# Symbol specifications
+
+dotnet_naming_symbols.interfaces.applicable_kinds = interface
+dotnet_naming_symbols.interfaces.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.interfaces.required_modifiers = 
+
+dotnet_naming_symbols.enums.applicable_kinds = enum
+dotnet_naming_symbols.enums.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.enums.required_modifiers = 
+
+dotnet_naming_symbols.events.applicable_kinds = event
+dotnet_naming_symbols.events.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.events.required_modifiers = 
+
+dotnet_naming_symbols.methods.applicable_kinds = method
+dotnet_naming_symbols.methods.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.methods.required_modifiers = 
+
+dotnet_naming_symbols.properties.applicable_kinds = property
+dotnet_naming_symbols.properties.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.properties.required_modifiers = 
+
+dotnet_naming_symbols.public_fields.applicable_kinds = field
+dotnet_naming_symbols.public_fields.applicable_accessibilities = public, internal
+dotnet_naming_symbols.public_fields.required_modifiers = 
+
+dotnet_naming_symbols.private_fields.applicable_kinds = field
+dotnet_naming_symbols.private_fields.applicable_accessibilities = private, protected, protected_internal, private_protected
+dotnet_naming_symbols.private_fields.required_modifiers = 
+
+dotnet_naming_symbols.private_static_fields.applicable_kinds = field
+dotnet_naming_symbols.private_static_fields.applicable_accessibilities = private, protected, protected_internal, private_protected
+dotnet_naming_symbols.private_static_fields.required_modifiers = static
+
+dotnet_naming_symbols.types_and_namespaces.applicable_kinds = namespace, class, struct, interface, enum
+dotnet_naming_symbols.types_and_namespaces.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.types_and_namespaces.required_modifiers = 
+
+dotnet_naming_symbols.non_field_members.applicable_kinds = property, event, method
+dotnet_naming_symbols.non_field_members.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
+dotnet_naming_symbols.non_field_members.required_modifiers = 
+
+dotnet_naming_symbols.type_parameters.applicable_kinds = namespace
+dotnet_naming_symbols.type_parameters.applicable_accessibilities = *
+dotnet_naming_symbols.type_parameters.required_modifiers = 
+
+dotnet_naming_symbols.private_constant_fields.applicable_kinds = field
+dotnet_naming_symbols.private_constant_fields.applicable_accessibilities = private, protected, protected_internal, private_protected
+dotnet_naming_symbols.private_constant_fields.required_modifiers = const
+
+dotnet_naming_symbols.local_variables.applicable_kinds = local
+dotnet_naming_symbols.local_variables.applicable_accessibilities = local
+dotnet_naming_symbols.local_variables.required_modifiers = 
+
+dotnet_naming_symbols.local_constants.applicable_kinds = local
+dotnet_naming_symbols.local_constants.applicable_accessibilities = local
+dotnet_naming_symbols.local_constants.required_modifiers = const
+
+dotnet_naming_symbols.parameters.applicable_kinds = parameter
+dotnet_naming_symbols.parameters.applicable_accessibilities = *
+dotnet_naming_symbols.parameters.required_modifiers = 
+
+dotnet_naming_symbols.public_constant_fields.applicable_kinds = field
+dotnet_naming_symbols.public_constant_fields.applicable_accessibilities = public, internal
+dotnet_naming_symbols.public_constant_fields.required_modifiers = const
+
+dotnet_naming_symbols.public_static_readonly_fields.applicable_kinds = field
+dotnet_naming_symbols.public_static_readonly_fields.applicable_accessibilities = public, internal
+dotnet_naming_symbols.public_static_readonly_fields.required_modifiers = readonly, static
+
+dotnet_naming_symbols.private_static_readonly_fields.applicable_kinds = field
+dotnet_naming_symbols.private_static_readonly_fields.applicable_accessibilities = private, protected, protected_internal, private_protected
+dotnet_naming_symbols.private_static_readonly_fields.required_modifiers = readonly, static
+
+dotnet_naming_symbols.local_functions.applicable_kinds = local_function
+dotnet_naming_symbols.local_functions.applicable_accessibilities = *
+dotnet_naming_symbols.local_functions.required_modifiers = 
+
+# Naming styles
+
+dotnet_naming_style.pascalcase.required_prefix = 
+dotnet_naming_style.pascalcase.required_suffix = 
+dotnet_naming_style.pascalcase.word_separator = 
+dotnet_naming_style.pascalcase.capitalization = pascal_case
+
+dotnet_naming_style.ipascalcase.required_prefix = I
+dotnet_naming_style.ipascalcase.required_suffix = 
+dotnet_naming_style.ipascalcase.word_separator = 
+dotnet_naming_style.ipascalcase.capitalization = pascal_case
+
+dotnet_naming_style.tpascalcase.required_prefix = T
+dotnet_naming_style.tpascalcase.required_suffix = 
+dotnet_naming_style.tpascalcase.word_separator = 
+dotnet_naming_style.tpascalcase.capitalization = pascal_case
+
+dotnet_naming_style._camelcase.required_prefix = _
+dotnet_naming_style._camelcase.required_suffix = 
+dotnet_naming_style._camelcase.word_separator = 
+dotnet_naming_style._camelcase.capitalization = camel_case
+
+dotnet_naming_style.camelcase.required_prefix = 
+dotnet_naming_style.camelcase.required_suffix = 
+dotnet_naming_style.camelcase.word_separator = 
+dotnet_naming_style.camelcase.capitalization = camel_case
+
+dotnet_naming_style.s_camelcase.required_prefix = s_
+dotnet_naming_style.s_camelcase.required_suffix = 
+dotnet_naming_style.s_camelcase.word_separator = 
+dotnet_naming_style.s_camelcase.capitalization = camel_case
+

src/ParagonPlayground/backend/.gitignore

@@ -0,0 +1,491 @@
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+##
+## Get latest from `dotnet new gitignore`
+
+# appsettings
+appsettings*.json
+!appsettings.Example.json
+
+# dotenv files
+.env
+
+# User-specific files
+*.rsuser
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Mono auto generated files
+mono_crash.*
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+[Ww][Ii][Nn]32/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+[Ll]ogs/
+
+# Visual Studio 2015/2017 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# Visual Studio 2017 auto generated files
+Generated\ Files/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUnit
+*.VisualState.xml
+TestResult.xml
+nunit-*.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# Benchmark Results
+BenchmarkDotNet.Artifacts/
+
+# .NET
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+# Tye
+.tye/
+
+# ASP.NET Scaffolding
+ScaffoldingReadMe.txt
+
+# StyleCop
+StyleCopReport.xml
+
+# Files built by Visual Studio
+*_i.c
+*_p.c
+*_h.h
+*.ilk
+*.meta
+*.obj
+*.iobj
+*.pch
+*.pdb
+*.ipdb
+*.pgc
+*.pgd
+*.rsp
+# but not Directory.Build.rsp, as it configures directory-level build defaults
+!Directory.Build.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*_wpftmp.csproj
+*.log
+*.tlog
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
+*.sdf
+*.cachefile
+*.VC.db
+*.VC.VC.opendb
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# Visual Studio Trace Files
+*.e2e
+# but not directories ending in .e2e
+!*.e2e/
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# AxoCover is a Code Coverage Tool
+.axoCover/*
+!.axoCover/settings.json
+
+# Coverlet is a free, cross platform Code Coverage Tool
+coverage*.json
+coverage*.xml
+coverage*.info
+
+# Visual Studio code coverage results
+*.coverage
+*.coveragexml
+
+# NCrunch
+_NCrunch_*
+.*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
+*.mm.*
+AutoTest.Net/
+
+# Web workbench (sass)
+.sass-cache/
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.[Pp]ublish.xml
+*.azurePubxml
+# Note: Comment the next line if you want to checkin your web deploy settings,
+# but database connection strings (with potential passwords) will be unencrypted
+*.pubxml
+*.publishproj
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+PublishScripts/
+
+# NuGet Packages
+*.nupkg
+# NuGet Symbol Packages
+*.snupkg
+# The packages folder can be ignored because of Package Restore
+**/[Pp]ackages/*
+# except build/, which is used as an MSBuild target.
+!**/[Pp]ackages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/[Pp]ackages/repositories.config
+# NuGet v3's project.json files produces more ignorable files
+*.nuget.props
+*.nuget.targets
+
+# Microsoft Azure Build Output
+csx/
+*.build.csdef
+
+# Microsoft Azure Emulator
+ecf/
+rcf/
+
+# Windows Store app package directories and files
+AppPackages/
+BundleArtifacts/
+Package.StoreAssociation.xml
+_pkginfo.txt
+*.appx
+*.appxbundle
+*.appxupload
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!?*.[Cc]ache/
+
+# Others
+ClientBin/
+~$*
+*~
+*.dbmdl
+*.dbproj.schemaview
+*.jfm
+*.pfx
+*.publishsettings
+orleans.codegen.cs
+
+# Including strong name files can present a security risk
+# (https://github.com/github/gitignore/pull/2483#issue-259490424)
+#*.snk
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+ServiceFabricBackup/
+*.rptproj.bak
+
+# SQL Server files
+*.mdf
+*.ldf
+*.ndf
+
+# Business Intelligence projects
+*.rdl.data
+*.bim.layout
+*.bim_*.settings
+*.rptproj.rsuser
+*- [Bb]ackup.rdl
+*- [Bb]ackup ([0-9]).rdl
+*- [Bb]ackup ([0-9][0-9]).rdl
+
+# Microsoft Fakes
+FakesAssemblies/
+
+# GhostDoc plugin setting file
+*.GhostDoc.xml
+
+# Node.js Tools for Visual Studio
+.ntvs_analysis.dat
+node_modules/
+
+# Visual Studio 6 build log
+*.plg
+
+# Visual Studio 6 workspace options file
+*.opt
+
+# Visual Studio 6 auto-generated workspace file (contains which files were open etc.)
+*.vbw
+
+# Visual Studio 6 auto-generated project file (contains which files were open etc.)
+*.vbp
+
+# Visual Studio 6 workspace and project file (working project files containing files to include in project)
+*.dsw
+*.dsp
+
+# Visual Studio 6 technical files
+*.ncb
+*.aps
+
+# Visual Studio LightSwitch build output
+**/*.HTMLClient/GeneratedArtifacts
+**/*.DesktopClient/GeneratedArtifacts
+**/*.DesktopClient/ModelManifest.xml
+**/*.Server/GeneratedArtifacts
+**/*.Server/ModelManifest.xml
+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# CodeRush personal settings
+.cr/personal
+
+# Python Tools for Visual Studio (PTVS)
+__pycache__/
+*.pyc
+
+# Cake - Uncomment if you are using it
+# tools/**
+# !tools/packages.config
+
+# Tabs Studio
+*.tss
+
+# Telerik's JustMock configuration file
+*.jmconfig
+
+# BizTalk build output
+*.btp.cs
+*.btm.cs
+*.odx.cs
+*.xsd.cs
+
+# OpenCover UI analysis results
+OpenCover/
+
+# Azure Stream Analytics local run output
+ASALocalRun/
+
+# MSBuild Binary and Structured Log
+*.binlog
+
+# NVidia Nsight GPU debugger configuration file
+*.nvuser
+
+# MFractors (Xamarin productivity tool) working folder
+.mfractor/
+
+# Local History for Visual Studio
+.localhistory/
+
+# Visual Studio History (VSHistory) files
+.vshistory/
+
+# BeatPulse healthcheck temp database
+healthchecksdb
+
+# Backup folder for Package Reference Convert tool in Visual Studio 2017
+MigrationBackup/
+
+# Ionide (cross platform F# VS Code tools) working folder
+.ionide/
+
+# Fody - auto-generated XML schema
+FodyWeavers.xsd
+
+# VS Code files for those working on multiple tools
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+*.code-workspace
+
+# Official VS Code C# Dev Kit Extension exclusion
+*.lscache
+
+# Local History for Visual Studio Code
+.history/
+
+# Windows Installer files from build outputs
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# JetBrains Rider
+*.sln.iml
+.idea/
+
+##
+## Visual studio for Mac
+##
+
+
+# globs
+Makefile.in
+*.userprefs
+*.usertasks
+config.make
+config.status
+aclocal.m4
+install-sh
+autom4te.cache/
+*.tar.gz
+tarballs/
+test-results/
+
+# content below from: https://github.com/github/gitignore/blob/main/Global/macOS.gitignore
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# content below from: https://github.com/github/gitignore/blob/main/Global/Windows.gitignore
+# Windows thumbnail cache files
+Thumbs.db
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# Vim temporary swap files
+*.swp

src/ParagonPlayground/backend/Directory.Build.props

@@ -0,0 +1,16 @@
+<Project>
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <AnalysisLevel>latest</AnalysisLevel>
+    <AnalysisMode>All</AnalysisMode>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <CodeAnalysisTreatWarningsAsErrors>true</CodeAnalysisTreatWarningsAsErrors>
+    <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
+    <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <NoWarn>$(NoWarn);NU1903</NoWarn>
+  </PropertyGroup>
+
+</Project>

src/ParagonPlayground/backend/Dockerfile

@@ -0,0 +1,27 @@
+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+WORKDIR /src
+
+COPY ParagonPlayground.slnx ./
+COPY Directory.Build.props ./
+COPY src/Directory.Build.props src/
+COPY src/Directory.Packages.props src/
+COPY src/ParagonPlayground.Domain/ParagonPlayground.Domain.csproj src/ParagonPlayground.Domain/
+COPY src/ParagonPlayground.Infrastructure/ParagonPlayground.Infrastructure.csproj src/ParagonPlayground.Infrastructure/
+COPY src/ParagonPlayground.Api/ParagonPlayground.Api.csproj src/ParagonPlayground.Api/
+RUN dotnet restore src/ParagonPlayground.Api/ParagonPlayground.Api.csproj
+
+COPY . .
+RUN dotnet publish src/ParagonPlayground.Api/ParagonPlayground.Api.csproj -c Debug -o /app
+
+FROM mcr.microsoft.com/dotnet/aspnet:10.0 AS runtime
+WORKDIR /app
+EXPOSE 8080
+COPY --from=build /app .
+
+RUN apt-get update && \
+    apt-get install -y unzip curl && \
+    curl -sSL https://aka.ms/getvsdbgsh | /bin/sh /dev/stdin -v latest -l /vsdbg && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+ENTRYPOINT ["dotnet", "ParagonPlayground.Api.dll"]

src/ParagonPlayground/backend/ParagonPlayground.slnx

@@ -0,0 +1,8 @@
+<Solution>
+  <Folder Name="/src/">
+    <Project Path="src/ParagonPlayground.Api/ParagonPlayground.Api.csproj" />
+    <Project Path="src/ParagonPlayground.Cli/ParagonPlayground.Cli.csproj" />
+    <Project Path="src/ParagonPlayground.Domain/ParagonPlayground.Domain.csproj" />
+    <Project Path="src/ParagonPlayground.Infrastructure/ParagonPlayground.Infrastructure.csproj" />
+  </Folder>
+</Solution>

src/ParagonPlayground/backend/src/Directory.Build.props

@@ -0,0 +1,10 @@
+<Project>
+
+  <Import Project="$([MSBuild]::GetPathOfFileAbove('Directory.Build.props', '$(MSBuildThisFileDirectory)../'))" />
+
+  <ItemGroup>
+    <InternalsVisibleTo Include="$(AssemblyName).Tests" />
+    <InternalsVisibleTo Include="DynamicProxyGenAssembly2" />
+  </ItemGroup>
+
+</Project>

src/ParagonPlayground/backend/src/Directory.Packages.props

@@ -0,0 +1,18 @@
+<Project>
+
+  <PropertyGroup>
+    <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageVersion Include="MongoDB.Driver" Version="3.10.0" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="10.0.10" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration.Json" Version="10.0.10" />
+    <PackageVersion Include="Spectre.Console" Version="0.57.2" />
+    <PackageVersion Include="Spectre.Console.Cli" Version="0.55.0" />
+    <PackageVersion Include="BCrypt.Net-Next" Version="4.2.0" />
+    <PackageVersion Include="Microsoft.AspNetCore.Http.Abstractions" Version="2.3.11" />
+    <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.10" />
+  </ItemGroup>
+
+</Project>

src/ParagonPlayground/backend/src/ParagonPlayground.Api/.editorconfig

@@ -0,0 +1,2 @@
+[*.{cs,vb}]
+dotnet_diagnostic.CA2007.severity = none

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Context/ContextKeys.cs

@@ -0,0 +1,9 @@
+namespace ParagonPlayground.Api.Context;
+
+internal static class ContextKeys
+{
+  internal const string Session = nameof(Session);
+  internal const string SessionToken = nameof(SessionToken);
+  internal const string User = nameof(User);
+  internal const string Organization = nameof(Organization);
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Context/HttpContextExtensions.cs

@@ -0,0 +1,46 @@
+using ParagonPlayground.Domain.Entities;
+
+namespace ParagonPlayground.Api.Context;
+
+internal static class HttpContextExtensions
+{
+  internal static void SetSession(this HttpContext context, Session? session)
+  {
+    context.Items[ContextKeys.Session] = session;
+  }
+
+  internal static Session? GetSession(this HttpContext context)
+  {
+    return context.Items[ContextKeys.Session] as Session;
+  }
+
+  internal static void SetSessionToken(this HttpContext context, string? token)
+  {
+    context.Items[ContextKeys.SessionToken] = token;
+  }
+
+  internal static string? GetSessionToken(this HttpContext context)
+  {
+    return context.Items[ContextKeys.SessionToken] as string;
+  }
+
+  internal static void SetUser(this HttpContext context, User? user)
+  {
+    context.Items[ContextKeys.User] = user;
+  }
+
+  internal static User? GetUser(this HttpContext context)
+  {
+    return context.Items[ContextKeys.User] as User;
+  }
+
+  internal static void SetOrganization(this HttpContext context, Organization? org)
+  {
+    context.Items[ContextKeys.Organization] = org;
+  }
+
+  internal static Organization? GetOrganization(this HttpContext context)
+  {
+    return context.Items[ContextKeys.Organization] as Organization;
+  }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Endpoints/AuthEndpoints.cs

@@ -0,0 +1,116 @@
+using MongoDB.Bson;
+
+using ParagonPlayground.Api.Context;
+using ParagonPlayground.Api.Infrastructure;
+using ParagonPlayground.Domain.DTOs;
+using ParagonPlayground.Domain.Entities;
+using ParagonPlayground.Infrastructure.Data;
+using ParagonPlayground.Infrastructure.Services;
+
+namespace ParagonPlayground.Api.Endpoints;
+
+internal static class AuthEndpoints
+{
+  private static readonly TimeSpan SessionDuration = TimeSpan.FromDays(30);
+
+  internal static RouteGroupBuilder MapAuthEndpoints(this RouteGroupBuilder group)
+  {
+    _ = group.MapPost("/login", LoginAsync);
+    _ = group.MapPost("/logout", LogoutAsync);
+    _ = group.MapGet("/me", Me);
+    return group;
+  }
+
+  private static async Task<IResult> LoginAsync(
+    LoginRequest request,
+    UserRepository userRepo,
+    OrganizationRepository orgRepo,
+    SessionRepository sessionRepo,
+    PasswordService passwordService,
+    CookieService cookieService,
+    HttpContext context,
+    CancellationToken ct
+  )
+  {
+    ArgumentNullException.ThrowIfNull(request);
+
+    var user = await userRepo.GetByEmailAsync(request.Email, ct);
+
+    if (user is null || passwordService.Verify(request.Password, user.PasswordHash) is false)
+    {
+      return Results.Json(new { error = "Invalid email or password" }, statusCode: StatusCodes.Status401Unauthorized);
+    }
+
+    var org = await orgRepo.GetByIdAsync(user.OrganizationId, ct);
+
+    var sessionToken = TokenHelper.GenerateToken();
+    var session = new Session
+    {
+      Id = ObjectId.GenerateNewId().ToString(),
+      UserId = user.Id,
+      TokenHash = TokenHelper.HashToken(sessionToken),
+      CreatedAt = DateTime.UtcNow,
+      ExpiresAt = DateTime.UtcNow.Add(SessionDuration),
+    };
+
+    await sessionRepo.CreateAsync(session, ct);
+
+    var xsrfToken = TokenHelper.GenerateToken();
+
+    cookieService.SetSessionCookie(context, sessionToken, SessionDuration);
+    cookieService.SetXsrfCookie(context, xsrfToken, SessionDuration);
+
+    return Results.Ok(new UserResponse
+    {
+      Id = user.Id,
+      Email = user.Email,
+      DisplayName = user.DisplayName,
+      OrganizationId = org?.Id ?? string.Empty,
+      OrganizationName = org?.Name ?? string.Empty,
+      OrganizationSlug = org?.Slug ?? string.Empty,
+    });
+  }
+
+  private static async Task<IResult> LogoutAsync(
+    SessionRepository sessionRepo,
+    CookieService cookieService,
+    HttpContext context,
+    CancellationToken ct
+  )
+  {
+    var session = context.GetSession();
+
+    if (session is not null)
+    {
+      await sessionRepo.DeleteAsync(session.Id, ct);
+    }
+
+    cookieService.ClearSessionCookie(context);
+    cookieService.ClearXsrfCookie(context);
+
+    return Results.Ok(new { message = "Logged out" });
+  }
+
+  private static IResult Me(HttpContext context)
+  {
+    var user = context.GetUser();
+
+    if (user is null)
+    {
+      return Results.Json(new { error = "Not authenticated" }, statusCode: StatusCodes.Status401Unauthorized);
+    }
+
+    var org = context.GetOrganization();
+
+    return Results.Ok(new UserResponse
+    {
+      Id = user.Id,
+      Email = user.Email,
+      DisplayName = user.DisplayName,
+      OrganizationId = org?.Id ?? string.Empty,
+      OrganizationName = org?.Name ?? string.Empty,
+      OrganizationSlug = org?.Slug ?? string.Empty,
+    });
+  }
+
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Infrastructure/TokenHelper.cs

@@ -0,0 +1,17 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace ParagonPlayground.Api.Infrastructure;
+
+internal static class TokenHelper
+{
+  internal static string GenerateToken()
+  {
+    return Convert.ToHexString(RandomNumberGenerator.GetBytes(32));
+  }
+
+  internal static string HashToken(string token)
+  {
+    return Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(token)));
+  }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Middleware/SessionAuthMiddleware.cs

@@ -0,0 +1,52 @@
+using ParagonPlayground.Api.Context;
+using ParagonPlayground.Api.Infrastructure;
+using ParagonPlayground.Infrastructure.Data;
+using ParagonPlayground.Infrastructure.Services;
+
+namespace ParagonPlayground.Api.Middleware;
+
+internal class SessionAuthMiddleware(RequestDelegate next)
+{
+  private readonly RequestDelegate _next = next;
+
+  public async Task InvokeAsync(
+    HttpContext context,
+    SessionRepository sessionRepo,
+    UserRepository userRepo,
+    OrganizationRepository orgRepo,
+    CookieService cookieService
+  )
+  {
+    var ct = context.RequestAborted;
+    var sessionToken = cookieService.GetSessionToken(context);
+
+    if (string.IsNullOrEmpty(sessionToken) is false)
+    {
+      var tokenHash = TokenHelper.HashToken(sessionToken);
+      var session = await sessionRepo.GetByTokenHashAsync(tokenHash, ct);
+
+      if (session is not null && session.ExpiresAt > DateTime.UtcNow)
+      {
+        context.SetSession(session);
+        context.SetSessionToken(sessionToken);
+
+        var user = await userRepo.GetByIdAsync(session.UserId, ct);
+
+        if (user is not null)
+        {
+          context.SetUser(user);
+
+          var org = await orgRepo.GetByIdAsync(user.OrganizationId, ct);
+
+          if (org is not null)
+          {
+            context.SetOrganization(org);
+          }
+        }
+      }
+    }
+
+    await _next(context);
+  }
+
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Middleware/TenantResolutionMiddleware.cs

@@ -0,0 +1,24 @@
+using ParagonPlayground.Api.Context;
+using ParagonPlayground.Infrastructure.Data;
+
+namespace ParagonPlayground.Api.Middleware;
+
+internal class TenantResolutionMiddleware(RequestDelegate next)
+{
+  private readonly RequestDelegate _next = next;
+
+  public async Task InvokeAsync(HttpContext context, OrganizationRepository orgRepo)
+  {
+    if (context.Request.Headers.TryGetValue("X-Organization-Slug", out var slug))
+    {
+      var org = await orgRepo.GetBySlugAsync(slug.ToString(), context.RequestAborted);
+
+      if (org is not null)
+      {
+        context.SetOrganization(org);
+      }
+    }
+
+    await _next(context);
+  }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Options/MongoDbOptions.cs

@@ -0,0 +1,8 @@
+namespace ParagonPlayground.Api.Options;
+
+internal class MongoDbOptions
+{
+  public const string SectionName = "MongoDb";
+  public string ConnectionString { get; set; } = "mongodb://localhost:27017";
+  public string DatabaseName { get; set; } = "paragon_playground";
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Api/ParagonPlayground.Api.csproj

@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <ItemGroup>
+    <PackageReference Include="MongoDB.Driver" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference
+      Include="..\ParagonPlayground.Infrastructure\ParagonPlayground.Infrastructure.csproj" />
+  </ItemGroup>
+
+</Project>

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Program.cs

@@ -0,0 +1,36 @@
+using Microsoft.AspNetCore.HttpOverrides;
+
+using ParagonPlayground.Api.Endpoints;
+using ParagonPlayground.Api.Middleware;
+using ParagonPlayground.Api.Options;
+using ParagonPlayground.Infrastructure.Data;
+using ParagonPlayground.Infrastructure.Services;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.Configure<MongoDbOptions>(builder.Configuration.GetSection(MongoDbOptions.SectionName));
+builder.Services.AddSingleton(static sp =>
+{
+  var opts = sp.GetRequiredService<Microsoft.Extensions.Options.IOptions<MongoDbOptions>>().Value;
+  return new MongoDbContext(opts.ConnectionString, opts.DatabaseName);
+});
+
+builder.Services.AddSingleton<PasswordService>();
+builder.Services.AddSingleton<CookieService>();
+builder.Services.AddSingleton<OrganizationRepository>();
+builder.Services.AddSingleton<UserRepository>();
+builder.Services.AddSingleton<SessionRepository>();
+
+builder.Services.Configure<ForwardedHeadersOptions>(static options =>
+{
+  options.ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto;
+});
+
+var app = builder.Build();
+
+app.UseForwardedHeaders();
+app.UseMiddleware<TenantResolutionMiddleware>();
+app.UseMiddleware<SessionAuthMiddleware>();
+app.MapGroup("/api/auth").MapAuthEndpoints();
+
+app.Run();

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Properties/launchSettings.json

@@ -0,0 +1,14 @@
+{
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": false,
+      "applicationUrl": "http://localhost:5116",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Cli/.editorconfig

@@ -0,0 +1,3 @@
+[*.{cs,vb}]
+dotnet_diagnostic.CA2007.severity = none
+

src/ParagonPlayground/backend/src/ParagonPlayground.Cli/CliConfiguration.cs

@@ -0,0 +1,25 @@
+using Microsoft.Extensions.Configuration;
+
+namespace ParagonPlayground.Cli;
+
+internal static class CliConfiguration
+{
+  public static (string ConnectionString, string DatabaseName) GetMongoDbConfig()
+  {
+    var config = new ConfigurationBuilder()
+      .SetBasePath(Directory.GetCurrentDirectory())
+      .AddJsonFile("appsettings.json", optional: true, reloadOnChange: false)
+      .AddEnvironmentVariables()
+      .Build();
+
+    var connString = config.GetSection("MongoDb")["ConnectionString"]
+      ?? Environment.GetEnvironmentVariable("MONGODB_CONNECTION")
+      ?? "mongodb://localhost:27017";
+
+    var dbName = config.GetSection("MongoDb")["DatabaseName"]
+      ?? Environment.GetEnvironmentVariable("MONGODB_DATABASE")
+      ?? "paragon_playground";
+
+    return (connString, dbName);
+  }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Cli/Commands/ProvisionOrgCommand.cs

@@ -0,0 +1,50 @@
+using System.ComponentModel;
+
+using MongoDB.Bson;
+
+using ParagonPlayground.Domain.Entities;
+using ParagonPlayground.Infrastructure.Data;
+
+using Spectre.Console;
+using Spectre.Console.Cli;
+
+namespace ParagonPlayground.Cli.Commands;
+
+internal class ProvisionOrgCommand(OrganizationRepository orgRepo) : AsyncCommand<ProvisionOrgCommand.Settings>
+{
+  internal class Settings : CommandSettings
+  {
+    [Description("Organization name")]
+    [CommandOption("-n|--name")]
+    public required string Name { get; set; }
+
+    [Description("Organization slug (used as subdomain)")]
+    [CommandOption("-s|--slug")]
+    public required string Slug { get; set; }
+  }
+
+  protected override async Task<int> ExecuteAsync(CommandContext context, Settings settings, CancellationToken cancellationToken)
+  {
+    var existing = await orgRepo.GetBySlugAsync(settings.Slug, cancellationToken);
+
+    if (existing is not null)
+    {
+      AnsiConsole.MarkupLine($"[yellow]Organization with slug '{settings.Slug}' already exists (Id: {existing.Id})[/]");
+      return 0;
+    }
+
+    var org = new Organization
+    {
+      Id = ObjectId.GenerateNewId().ToString(),
+      Name = settings.Name,
+      Slug = settings.Slug,
+      CreatedAt = DateTime.UtcNow,
+    };
+
+    await orgRepo.CreateAsync(org, cancellationToken);
+
+    AnsiConsole.MarkupLine($"[green]Organization '{org.Name}' created with slug '{org.Slug}' (Id: {org.Id})[/]");
+
+    return 0;
+  }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Cli/Commands/ProvisionUserCommand.cs

@@ -0,0 +1,72 @@
+using System.ComponentModel;
+
+using MongoDB.Bson;
+
+using ParagonPlayground.Domain.Entities;
+using ParagonPlayground.Infrastructure.Data;
+using ParagonPlayground.Infrastructure.Services;
+
+using Spectre.Console;
+using Spectre.Console.Cli;
+
+namespace ParagonPlayground.Cli.Commands;
+
+internal class ProvisionUserCommand(
+  OrganizationRepository orgRepo,
+  UserRepository userRepo,
+  PasswordService passwordService) : AsyncCommand<ProvisionUserCommand.Settings>
+{
+  internal class Settings : CommandSettings
+  {
+    [Description("User email address")]
+    [CommandOption("-e|--email")]
+    public required string Email { get; set; }
+
+    [Description("User password")]
+    [CommandOption("-p|--password")]
+    public required string Password { get; set; }
+
+    [Description("Display name")]
+    [CommandOption("-n|--name")]
+    public required string Name { get; set; }
+
+    [Description("Organization slug")]
+    [CommandOption("-o|--org-slug")]
+    public required string OrgSlug { get; set; }
+  }
+
+  protected override async Task<int> ExecuteAsync(CommandContext context, Settings settings, CancellationToken cancellationToken)
+  {
+    var org = await orgRepo.GetBySlugAsync(settings.OrgSlug, cancellationToken);
+
+    if (org is null)
+    {
+      AnsiConsole.MarkupLine($"[red]Organization with slug '{settings.OrgSlug}' not found. Create it first with 'provision org'.[/]");
+      return 1;
+    }
+
+    var existing = await userRepo.GetByEmailAsync(settings.Email, cancellationToken);
+
+    if (existing is not null)
+    {
+      AnsiConsole.MarkupLine($"[yellow]User with email '{settings.Email}' already exists (Id: {existing.Id})[/]");
+      return 0;
+    }
+
+    var user = new User
+    {
+      Id = ObjectId.GenerateNewId().ToString(),
+      Email = settings.Email,
+      DisplayName = settings.Name,
+      PasswordHash = passwordService.Hash(settings.Password),
+      OrganizationId = org.Id,
+      CreatedAt = DateTime.UtcNow,
+    };
+
+    await userRepo.CreateAsync(user, cancellationToken);
+
+    AnsiConsole.MarkupLine($"[green]User '{user.Email}' created in org '{org.Name}' (Id: {user.Id})[/]");
+
+    return 0;
+  }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Cli/Commands/SeedCommand.cs

@@ -0,0 +1,78 @@
+using MongoDB.Bson;
+
+using ParagonPlayground.Domain.Entities;
+using ParagonPlayground.Infrastructure.Data;
+using ParagonPlayground.Infrastructure.Services;
+
+using Spectre.Console;
+using Spectre.Console.Cli;
+
+namespace ParagonPlayground.Cli.Commands;
+
+internal class SeedCommand(
+  OrganizationRepository orgRepo,
+  UserRepository userRepo,
+  PasswordService passwordService) : AsyncCommand<SeedCommand.Settings>
+{
+  internal class Settings : CommandSettings { }
+
+  protected override async Task<int> ExecuteAsync(CommandContext context, Settings settings, CancellationToken cancellationToken)
+  {
+    var org = await orgRepo.GetBySlugAsync("acme", cancellationToken);
+
+    if (org is null)
+    {
+      org = new Organization
+      {
+        Id = ObjectId.GenerateNewId().ToString(),
+        Name = "Acme Corp",
+        Slug = "acme",
+        CreatedAt = DateTime.UtcNow,
+      };
+
+      await orgRepo.CreateAsync(org, cancellationToken);
+
+      AnsiConsole.MarkupLine($"[green]Created org: {org.Name} (slug: {org.Slug})[/]");
+    }
+    else
+    {
+      AnsiConsole.MarkupLine($"[yellow]Org 'acme' already exists[/]");
+    }
+
+    var users = new[]
+    {
+      (Email: "alice@acme.com", Name: "Alice", Password: "password123"),
+      (Email: "bob@acme.com", Name: "Bob", Password: "password123"),
+    };
+
+    foreach (var (email, name, password) in users)
+    {
+      var existing = await userRepo.GetByEmailAsync(email, cancellationToken);
+
+      if (existing is null)
+      {
+        var user = new User
+        {
+          Id = ObjectId.GenerateNewId().ToString(),
+          Email = email,
+          DisplayName = name,
+          PasswordHash = passwordService.Hash(password),
+          OrganizationId = org.Id,
+          CreatedAt = DateTime.UtcNow,
+        };
+
+        await userRepo.CreateAsync(user, cancellationToken);
+
+        AnsiConsole.MarkupLine($"[green]Created user: {user.Email} ({user.DisplayName})[/]");
+      }
+      else
+      {
+        AnsiConsole.MarkupLine($"[yellow]User '{email}' already exists[/]");
+      }
+    }
+
+    AnsiConsole.MarkupLine("[bold green]Seed complete![/]");
+
+    return 0;
+  }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Cli/Infrastructure/TypeRegistrar.cs

@@ -0,0 +1,28 @@
+using Microsoft.Extensions.DependencyInjection;
+
+using Spectre.Console.Cli;
+
+namespace ParagonPlayground.Cli.Infrastructure;
+
+internal sealed class TypeRegistrar(IServiceCollection services) : ITypeRegistrar
+{
+  public ITypeResolver Build()
+  {
+    return new TypeResolver(services.BuildServiceProvider());
+  }
+
+  public void Register(Type service, Type implementation)
+  {
+    _ = services.AddSingleton(service, implementation);
+  }
+
+  public void RegisterInstance(Type service, object implementation)
+  {
+    _ = services.AddSingleton(service, implementation);
+  }
+
+  public void RegisterLazy(Type service, Func<object> factory)
+  {
+    _ = services.AddSingleton(service, _ => factory());
+  }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Cli/Infrastructure/TypeResolver.cs

@@ -0,0 +1,11 @@
+using Spectre.Console.Cli;
+
+namespace ParagonPlayground.Cli.Infrastructure;
+
+internal sealed class TypeResolver(IServiceProvider provider) : ITypeResolver
+{
+  public object? Resolve(Type? type)
+  {
+    return type is null ? null : provider.GetService(type);
+  }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Cli/ParagonPlayground.Cli.csproj

@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Json" />
+    <PackageReference Include="Spectre.Console" />
+    <PackageReference Include="Spectre.Console.Cli" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference
+      Include="..\ParagonPlayground.Infrastructure\ParagonPlayground.Infrastructure.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="appsettings.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>

src/ParagonPlayground/backend/src/ParagonPlayground.Cli/Program.cs

@@ -0,0 +1,31 @@
+using Microsoft.Extensions.DependencyInjection;
+
+using ParagonPlayground.Cli;
+using ParagonPlayground.Cli.Commands;
+using ParagonPlayground.Cli.Infrastructure;
+using ParagonPlayground.Infrastructure.Data;
+using ParagonPlayground.Infrastructure.Services;
+
+using Spectre.Console.Cli;
+
+var services = new ServiceCollection();
+
+var (connString, dbName) = CliConfiguration.GetMongoDbConfig();
+services.AddSingleton(_ => new MongoDbContext(connString, dbName));
+services.AddSingleton<OrganizationRepository>();
+services.AddSingleton<UserRepository>();
+services.AddSingleton<PasswordService>();
+
+var app = new CommandApp(new TypeRegistrar(services));
+
+app.Configure(static config =>
+{
+  _ = config.AddBranch("provision", static provision =>
+  {
+    _ = provision.AddCommand<ProvisionOrgCommand>("org");
+    _ = provision.AddCommand<ProvisionUserCommand>("user");
+    _ = provision.AddCommand<SeedCommand>("seed");
+  });
+});
+
+return app.Run(args);

src/ParagonPlayground/backend/src/ParagonPlayground.Domain/DTOs/LoginRequest.cs

@@ -0,0 +1,11 @@
+namespace ParagonPlayground.Domain.DTOs;
+
+/// <summary>Login credentials submitted by the user.</summary>
+public class LoginRequest
+{
+  /// <summary>User's email address.</summary>
+  public string Email { get; set; } = string.Empty;
+
+  /// <summary>User's plain-text password.</summary>
+  public string Password { get; set; } = string.Empty;
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Domain/DTOs/UserResponse.cs

@@ -0,0 +1,23 @@
+namespace ParagonPlayground.Domain.DTOs;
+
+/// <summary>Public user profile returned by the API.</summary>
+public class UserResponse
+{
+  /// <summary>Unique identifier of the user.</summary>
+  public string Id { get; set; } = string.Empty;
+
+  /// <summary>User's email address.</summary>
+  public string Email { get; set; } = string.Empty;
+
+  /// <summary>Display name shown in the UI.</summary>
+  public string DisplayName { get; set; } = string.Empty;
+
+  /// <summary>Identifier of the user's organization.</summary>
+  public string OrganizationId { get; set; } = string.Empty;
+
+  /// <summary>Display name of the user's organization.</summary>
+  public string OrganizationName { get; set; } = string.Empty;
+
+  /// <summary>URL-friendly slug of the user's organization.</summary>
+  public string OrganizationSlug { get; set; } = string.Empty;
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Domain/Entities/Organization.cs

@@ -0,0 +1,17 @@
+namespace ParagonPlayground.Domain.Entities;
+
+/// <summary>Represents a tenant organization in the system.</summary>
+public class Organization
+{
+  /// <summary>Unique identifier (MongoDB ObjectId).</summary>
+  public string Id { get; set; } = string.Empty;
+
+  /// <summary>Display name of the organization.</summary>
+  public string Name { get; set; } = string.Empty;
+
+  /// <summary>URL-friendly slug used for subdomain routing.</summary>
+  public string Slug { get; set; } = string.Empty;
+
+  /// <summary>Timestamp when the organization was created.</summary>
+  public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Domain/Entities/Session.cs

@@ -0,0 +1,20 @@
+namespace ParagonPlayground.Domain.Entities;
+
+/// <summary>Represents an authenticated user session.</summary>
+public class Session
+{
+  /// <summary>Unique identifier (MongoDB ObjectId).</summary>
+  public string Id { get; set; } = string.Empty;
+
+  /// <summary>Identifier of the user this session belongs to.</summary>
+  public string UserId { get; set; } = string.Empty;
+
+  /// <summary>Hashed authentication token.</summary>
+  public string TokenHash { get; set; } = string.Empty;
+
+  /// <summary>Timestamp when the session was created.</summary>
+  public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+  /// <summary>Timestamp when the session expires and becomes invalid.</summary>
+  public DateTime ExpiresAt { get; set; }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Domain/Entities/User.cs

@@ -0,0 +1,23 @@
+namespace ParagonPlayground.Domain.Entities;
+
+/// <summary>Represents a registered user within an organization.</summary>
+public class User
+{
+  /// <summary>Unique identifier (MongoDB ObjectId).</summary>
+  public string Id { get; set; } = string.Empty;
+
+  /// <summary>User's email address (used as login).</summary>
+  public string Email { get; set; } = string.Empty;
+
+  /// <summary>Display name shown in the UI.</summary>
+  public string DisplayName { get; set; } = string.Empty;
+
+  /// <summary>BCrypt hash of the user's password.</summary>
+  public string PasswordHash { get; set; } = string.Empty;
+
+  /// <summary>Identifier of the organization this user belongs to.</summary>
+  public string OrganizationId { get; set; } = string.Empty;
+
+  /// <summary>Timestamp when the user was created.</summary>
+  public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Domain/ParagonPlayground.Domain.csproj

@@ -0,0 +1,3 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+</Project>

src/ParagonPlayground/backend/src/ParagonPlayground.Infrastructure/Data/MongoDbContext.cs

@@ -0,0 +1,39 @@
+using MongoDB.Driver;
+
+using ParagonPlayground.Domain.Entities;
+
+namespace ParagonPlayground.Infrastructure.Data;
+
+/// <summary>MongoDB data access context.</summary>
+public sealed class MongoDbContext : IDisposable
+{
+  private readonly MongoClient _client;
+  private readonly IMongoDatabase _database;
+
+  /// <summary>Organizations collection.</summary>
+  public IMongoCollection<Organization> Organizations =>
+      _database.GetCollection<Organization>("Organizations");
+
+  /// <summary>Users collection.</summary>
+  public IMongoCollection<User> Users =>
+      _database.GetCollection<User>("Users");
+
+  /// <summary>Sessions collection.</summary>
+  public IMongoCollection<Session> Sessions =>
+      _database.GetCollection<Session>("Sessions");
+
+  /// <summary>Initializes a new MongoDbContext and connects to the specified database.</summary>
+  public MongoDbContext(string connectionString, string databaseName)
+  {
+    _client = new MongoClient(connectionString);
+    _database = _client.GetDatabase(databaseName);
+  }
+
+  /// <summary>Releases the underlying MongoClient.</summary>
+  public void Dispose()
+  {
+    _client.Dispose();
+    GC.SuppressFinalize(this);
+  }
+
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Infrastructure/Data/OrganizationRepository.cs

@@ -0,0 +1,29 @@
+using MongoDB.Driver;
+
+using ParagonPlayground.Domain.Entities;
+
+namespace ParagonPlayground.Infrastructure.Data;
+
+/// <summary>Repository for organization data access.</summary>
+public class OrganizationRepository(MongoDbContext context)
+{
+  private readonly MongoDbContext _context = context;
+
+  /// <summary>Finds an organization by its URL slug.</summary>
+  public async Task<Organization?> GetBySlugAsync(string slug, CancellationToken cancellationToken)
+  {
+    return await _context.Organizations.Find(o => o.Slug == slug).FirstOrDefaultAsync(cancellationToken).ConfigureAwait(false);
+  }
+
+  /// <summary>Finds an organization by its unique identifier.</summary>
+  public async Task<Organization?> GetByIdAsync(string id, CancellationToken cancellationToken)
+  {
+    return await _context.Organizations.Find(o => o.Id == id).FirstOrDefaultAsync(cancellationToken).ConfigureAwait(false);
+  }
+
+  /// <summary>Creates a new organization in the database.</summary>
+  public async Task CreateAsync(Organization organization, CancellationToken cancellationToken)
+  {
+    await _context.Organizations.InsertOneAsync(organization, cancellationToken: cancellationToken).ConfigureAwait(false);
+  }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Infrastructure/Data/SessionRepository.cs

@@ -0,0 +1,35 @@
+using MongoDB.Driver;
+
+using ParagonPlayground.Domain.Entities;
+
+namespace ParagonPlayground.Infrastructure.Data;
+
+/// <summary>Repository for session data access.</summary>
+public class SessionRepository(MongoDbContext context)
+{
+  private readonly MongoDbContext _context = context;
+
+  /// <summary>Finds a session by its token hash.</summary>
+  public async Task<Session?> GetByTokenHashAsync(string tokenHash, CancellationToken cancellationToken)
+  {
+    return await _context.Sessions.Find(s => s.TokenHash == tokenHash).FirstOrDefaultAsync(cancellationToken).ConfigureAwait(false);
+  }
+
+  /// <summary>Creates a new session in the database.</summary>
+  public async Task CreateAsync(Session session, CancellationToken cancellationToken)
+  {
+    await _context.Sessions.InsertOneAsync(session, new InsertOneOptions(), cancellationToken).ConfigureAwait(false);
+  }
+
+  /// <summary>Deletes a session by its unique identifier.</summary>
+  public async Task DeleteAsync(string id, CancellationToken cancellationToken)
+  {
+    _ = await _context.Sessions.DeleteOneAsync(s => s.Id == id, cancellationToken).ConfigureAwait(false);
+  }
+
+  /// <summary>Deletes all sessions for a given user.</summary>
+  public async Task DeleteByUserIdAsync(string userId, CancellationToken cancellationToken)
+  {
+    _ = await _context.Sessions.DeleteManyAsync(s => s.UserId == userId, cancellationToken).ConfigureAwait(false);
+  }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Infrastructure/Data/UserRepository.cs

@@ -0,0 +1,29 @@
+using MongoDB.Driver;
+
+using ParagonPlayground.Domain.Entities;
+
+namespace ParagonPlayground.Infrastructure.Data;
+
+/// <summary>Repository for user data access.</summary>
+public class UserRepository(MongoDbContext context)
+{
+  private readonly MongoDbContext _context = context;
+
+  /// <summary>Finds a user by their email address.</summary>
+  public async Task<User?> GetByEmailAsync(string email, CancellationToken cancellationToken)
+  {
+    return await _context.Users.Find(u => u.Email == email).FirstOrDefaultAsync(cancellationToken).ConfigureAwait(false);
+  }
+
+  /// <summary>Finds a user by their unique identifier.</summary>
+  public async Task<User?> GetByIdAsync(string id, CancellationToken cancellationToken)
+  {
+    return await _context.Users.Find(u => u.Id == id).FirstOrDefaultAsync(cancellationToken).ConfigureAwait(false);
+  }
+
+  /// <summary>Creates a new user in the database.</summary>
+  public async Task CreateAsync(User user, CancellationToken cancellationToken)
+  {
+    await _context.Users.InsertOneAsync(user, new InsertOneOptions(), cancellationToken).ConfigureAwait(false);
+  }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Infrastructure/ParagonPlayground.Infrastructure.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <ItemGroup>
+    <ProjectReference Include="..\ParagonPlayground.Domain\ParagonPlayground.Domain.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="BCrypt.Net-Next" />
+    <PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" />
+    <PackageReference Include="MongoDB.Driver" />
+  </ItemGroup>
+
+
+</Project>

src/ParagonPlayground/backend/src/ParagonPlayground.Infrastructure/Services/CookieService.cs

@@ -0,0 +1,94 @@
+using Microsoft.AspNetCore.Http;
+
+namespace ParagonPlayground.Infrastructure.Services;
+
+/// <summary>Manages session and XSRF cookies.</summary>
+public class CookieService
+{
+  private const string SessionCookieName = "session";
+  private const string XsrfCookieName = "XSRF-TOKEN";
+  private const string XsrfHeaderName = "X-XSRF-Token";
+
+  /// <summary>Sets the HttpOnly session cookie.</summary>
+  public void SetSessionCookie(HttpContext context, string token, TimeSpan expiresIn)
+  {
+    ArgumentNullException.ThrowIfNull(context);
+
+    context.Response.Cookies.Append(SessionCookieName, token, new CookieOptions
+    {
+      HttpOnly = true,
+      Secure = context.Request.IsHttps,
+      SameSite = SameSiteMode.Strict,
+      Path = "/",
+      MaxAge = expiresIn,
+    });
+  }
+
+  /// <summary>Sets the client-accessible XSRF token cookie.</summary>
+  public void SetXsrfCookie(HttpContext context, string token, TimeSpan expiresIn)
+  {
+    ArgumentNullException.ThrowIfNull(context);
+
+    context.Response.Cookies.Append(XsrfCookieName, token, new CookieOptions
+    {
+      HttpOnly = false,
+      Secure = context.Request.IsHttps,
+      SameSite = SameSiteMode.Strict,
+      Path = "/",
+      MaxAge = expiresIn,
+    });
+  }
+
+  /// <summary>Clears the session cookie.</summary>
+  public void ClearSessionCookie(HttpContext context)
+  {
+    ArgumentNullException.ThrowIfNull(context);
+
+    context.Response.Cookies.Delete(SessionCookieName);
+  }
+
+  /// <summary>Clears the XSRF token cookie.</summary>
+  public void ClearXsrfCookie(HttpContext context)
+  {
+    ArgumentNullException.ThrowIfNull(context);
+
+    context.Response.Cookies.Delete(XsrfCookieName);
+  }
+
+  /// <summary>Reads the session token from the request cookie.</summary>
+  public string? GetSessionToken(HttpContext context)
+  {
+    ArgumentNullException.ThrowIfNull(context);
+
+    return context.Request.Cookies[SessionCookieName];
+  }
+
+  /// <summary>Reads the XSRF token from the request cookie.</summary>
+  public string? GetXsrfCookieValue(HttpContext context)
+  {
+    ArgumentNullException.ThrowIfNull(context);
+
+    return context.Request.Cookies[XsrfCookieName];
+  }
+
+  /// <summary>Reads the XSRF token from the request header.</summary>
+  public string? GetXsrfHeaderValue(HttpContext context)
+  {
+    ArgumentNullException.ThrowIfNull(context);
+
+    return context.Request.Headers[XsrfHeaderName];
+  }
+
+  /// <summary>Validates that the XSRF cookie matches the XSRF header.</summary>
+  public bool ValidateXsrf(HttpContext context)
+  {
+    ArgumentNullException.ThrowIfNull(context);
+
+    var cookieToken = GetXsrfCookieValue(context);
+    var headerToken = GetXsrfHeaderValue(context);
+
+    return string.IsNullOrEmpty(cookieToken) is false
+        && string.IsNullOrEmpty(headerToken) is false
+        && cookieToken == headerToken;
+  }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Infrastructure/Services/PasswordService.cs

@@ -0,0 +1,17 @@
+namespace ParagonPlayground.Infrastructure.Services;
+
+/// <summary>Provides password hashing and verification using BCrypt.</summary>
+public class PasswordService
+{
+  /// <summary>Hashes a plain-text password.</summary>
+  public string Hash(string password)
+  {
+    return BCrypt.Net.BCrypt.HashPassword(password);
+  }
+
+  /// <summary>Verifies a plain-text password against a BCrypt hash.</summary>
+  public bool Verify(string password, string hash)
+  {
+    return BCrypt.Net.BCrypt.Verify(password, hash);
+  }
+}