# Matrix server (synapse).
# This needs a secret provisioned, create with:
#    ns=matrix
#
#    SIGNING_KEY="$(kubectl run -n $ns -i --quiet --restart=Never --rm synapse-generate-config --image=matrixdotorg/synapse:v1.19.2 --env SYNAPSE_SERVER_NAME=dummy --env SYNAPSE_REPORT_STATS=no -o yaml --command -- sh -c '/start.py generate >/dev/null && cat /data/*.signing.key')"
#    kubectl -n $ns create secret generic synapse --from-literal=postgres_password=$(pwgen 24 1) --from-literal=macaroon_secret_key=$(pwgen 32 1) --from-literal=registration_shared_secret=$(pwgen 32 1) --from-literal=homeserver_signing_key="$SIGNING_KEY" --from-literal=redis_password=$(pwgen 32 1) --from-literal=worker_replication_secret=$(pwgen 32 1)
#    kubectl -n $ns create secret generic oauth2-cas-proxy --from-literal=oauth2_secret=...
#
# When migrating from matrix.libsonnet, instance signing key, redis passwsord
# and worker replication secret need to be added to existing synapse secret:
#
#    echo "homeserver_signing_key: $(kubectl -n $ns exec deploy/synapse -- sh -c 'cat /data/*.signing.key' | base64 -w0)"
#    echo "redis_password: $(pwgen 32 1 | tr -d '\n' | base64 -w0)"
#    echo "worker_replication_secret: $(pwgen 32 1 | tr -d '\n' | base64 -w0)"
#    kubectl -n $ns edit secret synapse
#    # ...add homeserver_signing_key, redis_password and worker_replication_secret keys
#
# Additionally some resources need to be explicitly removed due to
# label/annotations changes:
#    kubectl -n $ns delete deployment riot-web oauth2-cas-proxy wellknown synapse
#
# Some service configuration customization fields have been renamed:
#    .riotConfig → .riot.config
#    .synapseConfig → .synapse.config
#
# When migrating from CAS to OpenID Connect authentication scheme following need
# to be ensured:
#  * https://{homeserver}/_synapse/oidc/callback is added to allowed callback URLs list
#  * openid scope is enabled for configured client
#
# Sequencing appservices is fun. The appservice needs to run first (for
# instance, via a bootstrap job), and on startup it will spit out a
# registration file.  This registration file then needs to be fed to synapse -
# this is done via specialy named secrets (appservice-X-registration, for X key
# in the appservices object).
#
# For appservice-irc instances, you can use this oneliner magic to get the
# registration YAML from logs.
#    kubectl -n matrix create secret generic appservice-irc-freenode-registration --from-file=registration.yaml=<(kubectl -n matrix logs job/appservice-irc-freenode-bootstrap | tail -n +4 | sed -r 's/(.*aliases:.*)/      group_id: "+freenode:hackerspace.pl"\n\1/')
#
# For appservice-telegram instances, you can use this oneliner magic:
#    kubectl -n matrix create secret generic appservice-telegram-prod-registration --from-file=registration.yaml=<(kubectl -n matrix logs job/appservice-telegram-prod-bootstrap | grep -A 100 SNIPSNIP | grep -v SNIPSNIP)

local kube = import "../../../kube/kube.libsonnet";
local postgres = import "../../../kube/postgres.libsonnet";
local redis = import "../../../kube/redis.libsonnet";

local riot = import "./riot.libsonnet";
local cas = import "./cas.libsonnet";
local wellKnown = import "./wellknown.libsonnet";
local synapse = import "./synapse.libsonnet";

{
    local app = self,
    local cfg = app.cfg,
    cfg:: {
        namespace: error "cfg.namespace must be set",
        # webDomain is the domain name at which element will run
        webDomain: error "cfg.webDomain must be set",
        # serverName is the server part of the MXID this homeserver will cover
        serverName: error "cfg.serverName must be set",
        storageClassName: "waw-hdd-redundant-3",

        images: {
            synapse: "matrixdotorg/synapse:v1.25.0",
            riot: "vectorim/riot-web:v1.7.18",
            casProxy: "registry.k0.hswaw.net/q3k/oauth2-cas-proxy:0.1.4",
            appserviceIRC: "matrixdotorg/matrix-appservice-irc:release-0.17.1",
            # That's v0.8.2 - we just don't trust that host to not re-tag images.
            appserviceTelegram: "dock.mau.dev/tulir/mautrix-telegram@sha256:9e68eaa80c9e4a75d9a09ec92dc4898b12d48390e01efa4de40ce882a6f7e330",
            wellKnown: "registry.k0.hswaw.net/q3k/wellknown:1611960794-adbf560851a46ad0e58b42f0daad7ef19535687c",
        },

        # OpenID Connect provider configuration.
        # Currently only client_secret can be provided as a secretKeyRef.
        #
        # https://${cfg.webDomain}/_synapse/oidc/callback needs to be set as
        # allowed OAuth2/OpenID Connect callback URL
        #
        # See: https://github.com/matrix-org/synapse/blob/v1.25.0/docs/openid.md
        oidc: {
            enable: false,
            config: {
                issuer: error "oidc.config.issuer must be set",
                client_id: error "oidc.config.client_id must be set",
                client_secret: error "oidc.config.client_secret must be set",

                # Set this to true when migrating from existing CAS deployment
                allow_existing_users: false,
                user_mapping_provider: {
                    config: {
                        localpart_template: '{{ user.sub }}',
                        display_name_template: '{{ user.sub }}',
                    },
                },

                # Extra configuration required when migrating from
                # oauth2-cas-proxy bound to https://sso.hackerspace.pl
                # user_profile_method: "userinfo_endpoint",
                # client_auth_method: "client_secret_post",
            },
        },

        # Central Authentication Scheme, a single-sign-on system. Note: this flow is now called 'SSO' in Matrix, we keep this name for legacy reasons.
        # Refer to https://matrix.org/docs/spec/client_server/r0.6.1#sso-client-login
        cas: {
            # whether to enable the CAS proxy (ie. connect to hswaw sso via OAuth)
            enable: false,
            # generate client ID and secret in with your OAuth2 provider, refer to https://www.oauth.com/oauth2-servers/client-registration/client-id-secret/
            oauth2: {
                clientID:       error "cas.oauth2.clientID must be set",
                clientSecret:   error "cas.oauth2.clientSecret must be set",
                scope:          error "cas.oauth2.scope must be set",
                authorizeURL:   error "cas.oauth2.authorizeURL must be set",
                tokenURL:       error "cas.oauth2.tokenURL must be set",
                userinfoURL:    error "cas.oauth2.userinfoURL must be set",
            },
        },

        # Serve /.well-known/matrix configuration endpoints required when using
        # cfg.webDomain directly as mxid.
        wellKnown: false,
    },

    # DEPRECATED: this needs to be removed in favor of namespace.Contain() in
    # modules that depend on this (appservices/instance defintions)
    metadata(component):: {
        namespace: cfg.namespace,
        labels: {
            "app.kubernetes.io/name": "matrix",
            "app.kubernetes.io/managed-by": "kubecfg",
            "app.kubernetes.io/component": component,
        },
    },

    namespace: kube.Namespace(cfg.namespace),

    postgres3: postgres {
        cfg+: {
            namespace: cfg.namespace,
            appName: "synapse",
            database: "synapse",
            username: "synapse",
            prefix: "waw3-",
            password: { secretKeyRef: { name: "synapse", key: "postgres_password" } },
            storageClassName: cfg.storageClassName,
            storageSize: "100Gi",
            initdbArgs: "--encoding='UTF8' --lc-collate='C' --lc-ctype='C'",
        },
    },

    redis: redis {
        cfg+: {
            namespace: cfg.namespace,
            appName: "synapse",
            storageClassName: cfg.storageClassName,
            password: { secretKeyRef: { name: "synapse", key: "redis_password" } },
        },
    },

    riot: riot {
        ns: app.namespace,
        cfg+: {
            webDomain: cfg.webDomain,
            serverName: cfg.serverName,
            image: cfg.images.riot,
        },
    },

    cas: if cfg.cas.enable && cfg.oidc.enable then error "cfg.cas.enable and cfg.oidc.enable options are exclusive"
        else if cfg.cas.enable then cas {
        ns: app.namespace,
        cfg+: {
            image: cfg.images.casProxy,
            webDomain: cfg.webDomain,
            oauth2: cfg.cas.oauth2,
        },
    },

    wellKnown: if cfg.wellKnown then wellKnown {
        ns: app.namespace,
        cfg+: {
            image: cfg.images.wellKnown,
            webDomain: cfg.webDomain,
        },
    } else {},

    synapse: synapse {
        ns: app.namespace,
        postgres: app.postgres3,
        redis: app.redis,
        appservices: app.appservices,
        cfg+: app.cfg {
            image: app.cfg.images.synapse,

            macaroonSecretKey: { secretKeyRef: { name: "synapse", key: "macaroon_secret_key" } },
            registrationSharedSecret: { secretKeyRef: { name: "synapse", key: "registration_shared_secret" } },
            workerReplicationSecret: { secretKeyRef: { name: "synapse", key: "worker_replication_secret" } },
        },
    },

    // Any appservice you add here will require an appservice-X-registration
    // secret containing a registration.yaml file. Adding something to this
    // dictionary will cause Synapse to not start until that secret is
    // available - so change things carefully!
    // If bootstrapping a new appservice, just keep it out of this dictionary
    // until it spits you a registration YAML and you feed that to a secret.
    appservices: {},

    ingress: app.namespace.Contain(kube.Ingress("matrix")) {
        metadata+: {
            annotations+: {
                "kubernetes.io/tls-acme": "true",
                "certmanager.k8s.io/cluster-issuer": "letsencrypt-prod",
                "nginx.ingress.kubernetes.io/proxy-body-size": "0",
                "nginx.ingress.kubernetes.io/use-regex": "true",
            },
        },
        spec+: {
            tls: [
                {
                    hosts: [cfg.webDomain],
                    secretName: "synapse-tls",
                },
            ],
            rules: [
                {
                    host: cfg.webDomain,
                    http: {
                        paths: [
                            { path: path, backend: app.synapse.genericWorker.svc.name_port }
                            for path in app.synapse.genericWorker.paths
                        ] + [
                            { path: "/", backend: app.riot.svc.name_port },
                            { path: "/_matrix/media/", backend: app.synapse.mediaWorker.svc.name_port },
                            { path: "/_matrix/", backend: app.synapse.main.svc.name_port },

                            # Used by OpenID Connect login flow
                            { path: "/_synapse/", backend: app.synapse.main.svc.name_port },
                        ] + (if cfg.cas.enable then [
                            { path: "/_cas", backend: app.cas.svc.name_port },
                        ] else []) + (if cfg.wellKnown then [
                            { path: "/.well-known/matrix", backend: app.wellKnown.svc.name_port },
                        ] else [])
                    },
                }
            ],
        },
    },
}