Remove polylith/API mode (#2967)

This removes most of the code used for polylith/API mode.

This removes the `/api` internal endpoints entirely. 

Binary size change roughly 5%: 
```
51437560 Feb 13 10:15 dendrite-monolith-server # old
48759008 Feb 13 10:15 dendrite-monolith-server # new
```

1 files changed, 351 insertions, 0 deletions

diff --git a/dendrite-sample.yaml b/dendrite-sample.yaml
new file mode 100644
index 00000000..39be8d8b
--- /dev/null
+++ b/dendrite-sample.yaml
@@ -0,0 +1,351 @@
+# This is the Dendrite configuration file.
+#
+# The configuration is split up into sections - each Dendrite component has a
+# configuration section, in addition to the "global" section which applies to
+# all components.
+
+# The version of the configuration file.
+version: 2
+
+# Global Matrix configuration. This configuration applies to all components.
+global:
+  # The domain name of this homeserver.
+  server_name: localhost
+
+  # The path to the signing private key file, used to sign requests and events.
+  # Note that this is NOT the same private key as used for TLS! To generate a
+  # signing key, use "./bin/generate-keys --private-key matrix_key.pem".
+  private_key: matrix_key.pem
+
+  # The paths and expiry timestamps (as a UNIX timestamp in millisecond precision)
+  # to old signing keys that were formerly in use on this domain name. These
+  # keys will not be used for federation request or event signing, but will be
+  # provided to any other homeserver that asks when trying to verify old events.
+  old_private_keys:
+  #  If the old private key file is available:
+  #  - private_key: old_matrix_key.pem
+  #    expired_at: 1601024554498
+  #  If only the public key (in base64 format) and key ID are known:
+  #  - public_key: mn59Kxfdq9VziYHSBzI7+EDPDcBS2Xl7jeUdiiQcOnM=
+  #    key_id: ed25519:mykeyid
+  #    expired_at: 1601024554498
+
+  # How long a remote server can cache our server signing key before requesting it
+  # again. Increasing this number will reduce the number of requests made by other
+  # servers for our key but increases the period that a compromised key will be
+  # considered valid by other homeservers.
+  key_validity_period: 168h0m0s
+
+  # Global database connection pool, for PostgreSQL monolith deployments only. If
+  # this section is populated then you can omit the "database" blocks in all other
+  # sections. For monolith deployments using SQLite databases,
+  # you must configure the "database" block for each component instead.
+  database:
+    connection_string: postgresql://username:password@hostname/dendrite?sslmode=disable
+    max_open_conns: 90
+    max_idle_conns: 5
+    conn_max_lifetime: -1
+
+  # Configuration for in-memory caches. Caches can often improve performance by
+  # keeping frequently accessed items (like events, identifiers etc.) in memory
+  # rather than having to read them from the database.
+  cache:
+    # The estimated maximum size for the global cache in bytes, or in terabytes,
+    # gigabytes, megabytes or kilobytes when the appropriate 'tb', 'gb', 'mb' or
+    # 'kb' suffix is specified. Note that this is not a hard limit, nor is it a
+    # memory limit for the entire process. A cache that is too small may ultimately
+    # provide little or no benefit.
+    max_size_estimated: 1gb
+
+    # The maximum amount of time that a cache entry can live for in memory before
+    # it will be evicted and/or refreshed from the database. Lower values result in
+    # easier admission of new cache entries but may also increase database load in
+    # comparison to higher values, so adjust conservatively. Higher values may make
+    # it harder for new items to make it into the cache, e.g. if new rooms suddenly
+    # become popular.
+    max_age: 1h
+
+  # The server name to delegate server-server communications to, with optional port
+  # e.g. localhost:443
+  well_known_server_name: ""
+
+  # The server name to delegate client-server communications to, with optional port
+  # e.g. localhost:443
+  well_known_client_name: ""
+
+  # Lists of domains that the server will trust as identity servers to verify third
+  # party identifiers such as phone numbers and email addresses.
+  trusted_third_party_id_servers:
+    - matrix.org
+    - vector.im
+
+  # Disables federation. Dendrite will not be able to communicate with other servers
+  # in the Matrix federation and the federation API will not be exposed.
+  disable_federation: false
+
+  # Configures the handling of presence events. Inbound controls whether we receive
+  # presence events from other servers, outbound controls whether we send presence
+  # events for our local users to other servers.
+  presence:
+    enable_inbound: false
+    enable_outbound: false
+
+  # Configures phone-home statistics reporting. These statistics contain the server
+  # name, number of active users and some information on your deployment config.
+  # We use this information to understand how Dendrite is being used in the wild.
+  report_stats:
+    enabled: false
+    endpoint: https://matrix.org/report-usage-stats/push
+
+  # Server notices allows server admins to send messages to all users on the server.
+  server_notices:
+    enabled: false
+    # The local part, display name and avatar URL (as a mxc:// URL) for the user that
+    # will send the server notices. These are visible to all users on the deployment.
+    local_part: "_server"
+    display_name: "Server Alerts"
+    avatar_url: ""
+    # The room name to be used when sending server notices. This room name will
+    # appear in user clients.
+    room_name: "Server Alerts"
+
+  # Configuration for NATS JetStream
+  jetstream:
+    # A list of NATS Server addresses to connect to. If none are specified, an
+    # internal NATS server will be started automatically when running Dendrite in
+    # monolith mode.
+    addresses:
+    # - localhost:4222
+
+    # Disable the validation of TLS certificates of NATS. This is
+    # not recommended in production since it may allow NATS traffic
+    # to be sent to an insecure endpoint.
+    disable_tls_validation: false
+
+    # Persistent directory to store JetStream streams in. This directory should be
+    # preserved across Dendrite restarts.
+    storage_path: ./
+
+    # The prefix to use for stream names for this homeserver - really only useful
+    # if you are running more than one Dendrite server on the same NATS deployment.
+    topic_prefix: Dendrite
+
+  # Configuration for Prometheus metric collection.
+  metrics:
+    enabled: false
+    basic_auth:
+      username: metrics
+      password: metrics
+
+  # Optional DNS cache. The DNS cache may reduce the load on DNS servers if there
+  # is no local caching resolver available for use.
+  dns_cache:
+    enabled: false
+    cache_size: 256
+    cache_lifetime: "5m" # 5 minutes; https://pkg.go.dev/time@master#ParseDuration
+
+# Configuration for the Appservice API.
+app_service_api:
+  # Disable the validation of TLS certificates of appservices. This is
+  # not recommended in production since it may allow appservice traffic
+  # to be sent to an insecure endpoint.
+  disable_tls_validation: false
+
+  # Appservice configuration files to load into this homeserver.
+  config_files:
+  #  - /path/to/appservice_registration.yaml
+
+# Configuration for the Client API.
+client_api:
+  # Prevents new users from being able to register on this homeserver, except when
+  # using the registration shared secret below.
+  registration_disabled: true
+
+  # Prevents new guest accounts from being created. Guest registration is also
+  # disabled implicitly by setting 'registration_disabled' above.
+  guests_disabled: true
+
+  # If set, allows registration by anyone who knows the shared secret, regardless
+  # of whether registration is otherwise disabled.
+  registration_shared_secret: ""
+
+  # Whether to require reCAPTCHA for registration. If you have enabled registration
+  # then this is HIGHLY RECOMMENDED to reduce the risk of your homeserver being used
+  # for coordinated spam attacks.
+  enable_registration_captcha: false
+
+  # Settings for ReCAPTCHA.
+  recaptcha_public_key: ""
+  recaptcha_private_key: ""
+  recaptcha_bypass_secret: ""
+  
+  # To use hcaptcha.com instead of ReCAPTCHA, set the following parameters, otherwise just keep them empty.
+  # recaptcha_siteverify_api: "https://hcaptcha.com/siteverify"
+  # recaptcha_api_js_url: "https://js.hcaptcha.com/1/api.js"
+  # recaptcha_form_field: "h-captcha-response"
+  # recaptcha_sitekey_class: "h-captcha"
+
+
+  # TURN server information that this homeserver should send to clients.
+  turn:
+    turn_user_lifetime: "5m"
+    turn_uris:
+    #  - turn:turn.server.org?transport=udp
+    #  - turn:turn.server.org?transport=tcp
+    turn_shared_secret: ""
+    # If your TURN server requires static credentials, then you will need to enter
+    # them here instead of supplying a shared secret. Note that these credentials
+    # will be visible to clients!
+    # turn_username: ""
+    # turn_password: ""
+
+  # Settings for rate-limited endpoints. Rate limiting kicks in after the threshold
+  # number of "slots" have been taken by requests from a specific host. Each "slot"
+  # will be released after the cooloff time in milliseconds. Server administrators
+  # and appservice users are exempt from rate limiting by default.
+  rate_limiting:
+    enabled: true
+    threshold: 20
+    cooloff_ms: 500
+    exempt_user_ids:
+    #  - "@user:domain.com"
+
+# Configuration for the Federation API.
+federation_api:
+  # How many times we will try to resend a failed transaction to a specific server. The
+  # backoff is 2**x seconds, so 1 = 2 seconds, 2 = 4 seconds, 3 = 8 seconds etc. Once
+  # the max retries are exceeded, Dendrite will no longer try to send transactions to
+  # that server until it comes back to life and connects to us again.
+  send_max_retries: 16
+
+  # Disable the validation of TLS certificates of remote federated homeservers. Do not
+  # enable this option in production as it presents a security risk!
+  disable_tls_validation: false
+
+  # Disable HTTP keepalives, which also prevents connection reuse. Dendrite will typically
+  # keep HTTP connections open to remote hosts for 5 minutes as they can be reused much
+  # more quickly than opening new connections each time. Disabling keepalives will close
+  # HTTP connections immediately after a successful request but may result in more CPU and
+  # memory being used on TLS handshakes for each new connection instead.
+  disable_http_keepalives: false
+
+  # Perspective keyservers to use as a backup when direct key fetches fail. This may
+  # be required to satisfy key requests for servers that are no longer online when
+  # joining some rooms.
+  key_perspectives:
+    - server_name: matrix.org
+      keys:
+        - key_id: ed25519:auto
+          public_key: Noi6WqcDj0QmPxCNQqgezwTlBKrfqehY1u2FyWP9uYw
+        - key_id: ed25519:a_RXGa
+          public_key: l8Hft5qXKn1vfHrg3p4+W8gELQVo8N13JkluMfmn2sQ
+
+  # This option will control whether Dendrite will prefer to look up keys directly
+  # or whether it should try perspective servers first, using direct fetches as a
+  # last resort.
+  prefer_direct_fetch: false
+
+# Configuration for the Media API.
+media_api:
+  # Storage path for uploaded media. May be relative or absolute.
+  base_path: ./media_store
+
+  # The maximum allowed file size (in bytes) for media uploads to this homeserver
+  # (0 = unlimited). If using a reverse proxy, ensure it allows requests at least
+  #this large (e.g. the client_max_body_size setting in nginx).
+  max_file_size_bytes: 10485760
+
+  # Whether to dynamically generate thumbnails if needed.
+  dynamic_thumbnails: false
+
+  # The maximum number of simultaneous thumbnail generators to run.
+  max_thumbnail_generators: 10
+
+  # A list of thumbnail sizes to be generated for media content.
+  thumbnail_sizes:
+    - width: 32
+      height: 32
+      method: crop
+    - width: 96
+      height: 96
+      method: crop
+    - width: 640
+      height: 480
+      method: scale
+
+# Configuration for enabling experimental MSCs on this homeserver.
+mscs:
+  mscs:
+  #  - msc2836  # (Threading, see https://github.com/matrix-org/matrix-doc/pull/2836)
+  #  - msc2946  # (Spaces Summary, see https://github.com/matrix-org/matrix-doc/pull/2946)
+
+# Configuration for the Sync API.
+sync_api:
+  # This option controls which HTTP header to inspect to find the real remote IP
+  # address of the client. This is likely required if Dendrite is running behind
+  # a reverse proxy server.
+  # real_ip_header: X-Real-IP
+
+  # Configuration for the full-text search engine.
+  search:
+    # Whether or not search is enabled.
+    enabled: false
+
+    # The path where the search index will be created in.
+    index_path: "./searchindex"
+
+    # The language most likely to be used on the server - used when indexing, to
+    # ensure the returned results match expectations. A full list of possible languages
+    # can be found at https://github.com/blevesearch/bleve/tree/master/analysis/lang
+    language: "en"
+
+# Configuration for the User API.
+user_api:
+  # The cost when hashing passwords on registration/login. Default: 10. Min: 4, Max: 31
+  # See https://pkg.go.dev/golang.org/x/crypto/bcrypt for more information.
+  # Setting this lower makes registration/login consume less CPU resources at the cost
+  # of security should the database be compromised. Setting this higher makes registration/login
+  # consume more CPU resources but makes it harder to brute force password hashes. This value
+  # can be lowered if performing tests or on embedded Dendrite instances (e.g WASM builds).
+  bcrypt_cost: 10
+
+  # The length of time that a token issued for a relying party from
+  # /_matrix/client/r0/user/{userId}/openid/request_token endpoint
+  # is considered to be valid in milliseconds.
+  # The default lifetime is 3600000ms (60 minutes).
+  # openid_token_lifetime_ms: 3600000
+
+  # Users who register on this homeserver will automatically be joined to the rooms listed under "auto_join_rooms" option.
+  # By default, any room aliases included in this list will be created as a publicly joinable room
+  # when the first user registers for the homeserver. If the room already exists,
+  # make certain it is a publicly joinable room, i.e. the join rule of the room must be set to 'public'.
+  # As Spaces are just rooms under the hood, Space aliases may also be used.
+  auto_join_rooms:
+  #  - "#main:matrix.org"
+
+# Configuration for Opentracing.
+# See https://github.com/matrix-org/dendrite/tree/master/docs/tracing for information on
+# how this works and how to set it up.
+tracing:
+  enabled: false
+  jaeger:
+    serviceName: ""
+    disabled: false
+    rpc_metrics: false
+    tags: []
+    sampler: null
+    reporter: null
+    headers: null
+    baggage_restrictions: null
+    throttler: null
+
+# Logging configuration. The "std" logging type controls the logs being sent to
+# stdout. The "file" logging type controls logs being written to a log folder on
+# the disk. Supported log levels are "debug", "info", "warn", "error".
+logging:
+  - type: std
+    level: info
+  - type: file
+    level: info
+    params:
+      path: ./logs