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Crystal Client code for publishing to a Mercure Hub
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| MERCURE_URL=http://localhost:8000/.well-known/mercure | |
| MERCURE_JWT_SECRET=eyJhbGciOiJIUzI1NiJ9.eyJtZXJjdXJlIjp7InB1Ymxpc2giOlsiKiJdLCJzdWJzY3JpYmUiOlsiaHR0cHM6Ly9leGFtcGxlLmNvbS9teS1wcml2YXRlLXRvcGljIiwie3NjaGVtZX06Ly97K2hvc3R9L2RlbW8vYm9va3Mve2lkfS5qc29ubGQiLCIvLndlbGwta25vd24vbWVyY3VyZS9zdWJzY3JpcHRpb25zey90b3BpY317L3N1YnNjcmliZXJ9Il0sInBheWxvYWQiOnsidXNlciI6Imh0dHBzOi8vZXhhbXBsZS5jb20vdXNlcnMvZHVuZ2xhcyIsInJlbW90ZUFkZHIiOiIxMjcuMC4wLjEifX19.KKPIikwUzRuB3DTpVw6ajzwSChwFw5omBMmMcWKiDcM |
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| --- | |
| version: '3.8' | |
| services: | |
| nginx: | |
| image: nginx | |
| volumes: | |
| - ./public:/usr/share/nginx/html:ro | |
| environment: | |
| FOO: BAR | |
| ports: | |
| - '8080:80' | |
| mercure: | |
| image: dunglas/mercure | |
| restart: unless-stopped | |
| environment: | |
| SERVER_NAME: ':80' # Disable HTTPS for local dev | |
| MERCURE_PUBLISHER_JWT_KEY: '!ChangeThisMercureHubJWTSecretKey!' | |
| MERCURE_SUBSCRIBER_JWT_KEY: '!ChangeThisMercureHubJWTSecretKey!' | |
| MERCURE_EXTRA_DIRECTIVES: | | |
| cors_origins http://localhost:8080 | |
| anonymous | |
| MERCURE_CORS_ALLOWED_ORIGINS: '*' | |
| command: /usr/bin/caddy run --config /etc/caddy/Caddyfile.dev # Enable dev mode | |
| ports: | |
| - '8000:80' | |
| volumes: | |
| - mercure_data:/data | |
| - mercure_config:/config | |
| volumes: | |
| mercure_data: | |
| mercure_config: |
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| require "./update" | |
| module TokenProviderInterface | |
| abstract def jwt : String | |
| end | |
| @[ADI::Register(_jwt: ENV["MERCURE_JWT_SECRET"])] | |
| record StaticTokenProvider, jwt : String do | |
| include TokenProviderInterface | |
| end | |
| module TokenFactoryInterface | |
| abstract def create( | |
| subscribe : Array(String)? = [] of String, | |
| publish : Array(String)? = [] of String, | |
| additional_claims : Hash(String, String) = {} of String => String | |
| ) : String | |
| end | |
| module HubInterface | |
| abstract def url : String | |
| abstract def public_url : String | |
| abstract def token_provider : TokenProviderInterface | |
| abstract def token_factory : TokenFactoryInterface? | |
| abstract def publish(update : Update) : String | |
| end | |
| @[ADI::Register(_url: ENV["MERCURE_URL"])] | |
| class Hub | |
| include HubInterface | |
| getter url : String | |
| getter token_provider : TokenProviderInterface | |
| getter token_factory : TokenFactoryInterface? | |
| @public_url : String? | |
| def initialize( | |
| @url : String, | |
| @token_provider : TokenProviderInterface, | |
| @public_url : String? = nil, | |
| @token_factory : TokenFactoryInterface? = nil | |
| ) | |
| end | |
| def public_url : String | |
| @public_url || @url | |
| end | |
| def publish(update : Update) : String | |
| HTTP::Client.post( | |
| @url, | |
| headers: HTTP::Headers{ | |
| "Authorization" => "Bearer #{@token_provider.jwt}", | |
| }, | |
| form: URI::Params.build do |form| | |
| self.encode form, update | |
| end | |
| ).body | |
| end | |
| private def encode(form : URI::Params::Builder, update : Update) : Nil | |
| form.add "topic", update.topics | |
| form.add "data", update.data | |
| if update.private? | |
| form.add "private", "on" | |
| end | |
| if id = update.id | |
| form.add "id", id | |
| end | |
| if type = update.type | |
| form.add "type", type | |
| end | |
| if retry = update.retry | |
| form.add "retry", retry.to_s | |
| end | |
| end | |
| end |
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| <!DOCTYPE html> | |
| <html> | |
| <body> | |
| <script type="application/javascript"> | |
| const url = new URL('http://localhost:8000/.well-known/mercure'); | |
| url.searchParams.append('topic', 'https://example.com/my-private-topic'); | |
| const eventSource = new EventSource(url, { withCredentials: true }); | |
| console.log('listening...'); | |
| eventSource.onmessage = e => console.log(e); | |
| </script> | |
| </body> | |
| </html> |
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| require "athena" | |
| require "./hub" | |
| @[ADI::Register] | |
| class BookController < ATH::Controller | |
| def initialize(@hub : HubInterface); end | |
| @[ARTA::Get("/book/{id}")] | |
| def book(id : Int32) : String | |
| update = Update.new( | |
| "https://example.com/my-private-topic", | |
| {status: "Secretly checked out #{id}"}.to_json, | |
| private: true | |
| ) | |
| @hub.publish update | |
| end | |
| end | |
| ATH.run |
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| name: athena-mercure | |
| version: 0.1.0 | |
| description: | | |
| Proof of concept Athena Mercure integration | |
| dependencies: | |
| athena: | |
| github: athena-framework/framework | |
| version: ~> 0.18 |
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| struct Update | |
| getter topics : Array(String) | |
| getter data : String | |
| getter? private : Bool | |
| getter id : String? | |
| getter type : String? | |
| getter retry : Int32? | |
| def initialize( | |
| topics : String | Array(String), | |
| @data : String = "", | |
| @private : Bool = false, | |
| @id : String? = nil, | |
| @type : String? = nil, | |
| @retry : Int32? = nil | |
| ) | |
| @topics = topics.is_a?(String) ? [topics] : topics | |
| end | |
| end |
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