| 1 | import { operationsByName } from "./operations"; |
| 2 | |
| 3 | /** What the OpenAPI document needs to know about a REST route. */ |
| 4 | export type RouteDoc = { |
| 5 | method: "GET" | "POST"; |
| 6 | path: string; |
| 7 | operation: string; |
| 8 | tag: string; |
| 9 | }; |
| 10 | |
| 11 | const ERROR = { $ref: "#/components/schemas/Error" }; |
| 12 | |
| 13 | function errorResponse(description: string) { |
| 14 | return { |
| 15 | description, |
| 16 | content: { "application/json": { schema: ERROR } }, |
| 17 | }; |
| 18 | } |
| 19 | |
| 20 | /** A short title from an operation name: `open_intent` is "Open intent". */ |
| 21 | function title(operation: string): string { |
| 22 | if (operation === "whoami") return "Get the current user"; |
| 23 | const words = operation.split("_").join(" "); |
| 24 | return words[0].toUpperCase() + words.slice(1); |
| 25 | } |
| 26 | |
| 27 | /** Hono's `:name` path parameters as OpenAPI's `{name}`. */ |
| 28 | function openApiPath(path: string): string { |
| 29 | return path.replace(/:([a-z_]+)/g, "{$1}"); |
| 30 | } |
| 31 | |
| 32 | /** Hand-written entries for the two onboarding routes, which are not operations. */ |
| 33 | const ONBOARDING = { |
| 34 | "/v1/register": { |
| 35 | post: { |
| 36 | operationId: "register", |
| 37 | tags: ["Accounts"], |
| 38 | summary: "Register", |
| 39 | description: "Create an account. Sends a confirmation email.", |
| 40 | security: [], |
| 41 | requestBody: { |
| 42 | required: true, |
| 43 | content: { |
| 44 | "application/json": { |
| 45 | schema: { |
| 46 | type: "object", |
| 47 | required: ["username", "email", "password"], |
| 48 | properties: { |
| 49 | username: { |
| 50 | type: "string", |
| 51 | description: "Lowercase letters, digits and single hyphens; at most 39 characters.", |
| 52 | }, |
| 53 | email: { type: "string", format: "email" }, |
| 54 | password: { type: "string", minLength: 10 }, |
| 55 | }, |
| 56 | }, |
| 57 | }, |
| 58 | }, |
| 59 | }, |
| 60 | responses: { |
| 61 | "201": { description: "The account was created; a confirmation link was emailed." }, |
| 62 | "409": errorResponse("The username or email is already registered."), |
| 63 | "422": errorResponse("The input is not valid."), |
| 64 | }, |
| 65 | }, |
| 66 | }, |
| 67 | "/v1/tokens": { |
| 68 | post: { |
| 69 | operationId: "create_token", |
| 70 | tags: ["Accounts"], |
| 71 | summary: "Create token", |
| 72 | description: "Create an access token from a username and password.", |
| 73 | security: [], |
| 74 | requestBody: { |
| 75 | required: true, |
| 76 | content: { |
| 77 | "application/json": { |
| 78 | schema: { |
| 79 | type: "object", |
| 80 | required: ["username", "password"], |
| 81 | properties: { |
| 82 | username: { type: "string" }, |
| 83 | password: { type: "string" }, |
| 84 | name: { type: "string", description: "A label for the token." }, |
| 85 | }, |
| 86 | }, |
| 87 | }, |
| 88 | }, |
| 89 | }, |
| 90 | responses: { |
| 91 | "201": { |
| 92 | description: "The token, shown once.", |
| 93 | content: { |
| 94 | "application/json": { |
| 95 | schema: { |
| 96 | type: "object", |
| 97 | properties: { |
| 98 | token: { type: "string" }, |
| 99 | verified: { |
| 100 | type: "boolean", |
| 101 | description: "Whether the account's email is confirmed.", |
| 102 | }, |
| 103 | }, |
| 104 | }, |
| 105 | }, |
| 106 | }, |
| 107 | }, |
| 108 | "401": errorResponse("Incorrect username or password."), |
| 109 | }, |
| 110 | }, |
| 111 | }, |
| 112 | }; |
| 113 | |
| 114 | /** The OpenAPI document, generated from the same list the routes are. */ |
| 115 | export function openApiDocument(routes: RouteDoc[]) { |
| 116 | const paths: Record<string, Record<string, unknown>> = { ...ONBOARDING }; |
| 117 | for (const route of routes) { |
| 118 | const operation = operationsByName.get(route.operation)!; |
| 119 | const pathParams = [...route.path.matchAll(/:([a-z_]+)/g)].map((match) => match[1]); |
| 120 | // `owner` and `name` in the path stand for the operation's `repo` input. |
| 121 | const covered = new Set([...pathParams, "repo"]); |
| 122 | const inputs = Object.entries(operation.input.properties).filter( |
| 123 | ([name]) => !covered.has(name), |
| 124 | ); |
| 125 | const required = (operation.input.required ?? []).filter( |
| 126 | (name) => !covered.has(name), |
| 127 | ); |
| 128 | |
| 129 | const parameters: unknown[] = pathParams.map((name) => ({ |
| 130 | name, |
| 131 | in: "path", |
| 132 | required: true, |
| 133 | schema: { type: name === "number" ? "integer" : "string" }, |
| 134 | })); |
| 135 | let requestBody: unknown; |
| 136 | if (route.method === "GET") { |
| 137 | for (const [name, schema] of inputs) { |
| 138 | parameters.push({ |
| 139 | // The repository search parameter is `q` on the wire. |
| 140 | name: route.operation === "list_repos" && name === "query" ? "q" : name, |
| 141 | in: "query", |
| 142 | required: false, |
| 143 | schema, |
| 144 | }); |
| 145 | } |
| 146 | } else if (inputs.length > 0) { |
| 147 | requestBody = { |
| 148 | required: required.length > 0, |
| 149 | content: { |
| 150 | "application/json": { |
| 151 | schema: { |
| 152 | type: "object", |
| 153 | properties: Object.fromEntries(inputs), |
| 154 | ...(required.length > 0 ? { required } : {}), |
| 155 | }, |
| 156 | }, |
| 157 | }, |
| 158 | }; |
| 159 | } |
| 160 | |
| 161 | const path = openApiPath(route.path); |
| 162 | paths[path] ??= {}; |
| 163 | paths[path][route.method.toLowerCase()] = { |
| 164 | operationId: route.operation, |
| 165 | tags: [route.tag], |
| 166 | summary: title(route.operation), |
| 167 | description: operation.description, |
| 168 | parameters, |
| 169 | ...(requestBody ? { requestBody } : {}), |
| 170 | responses: { |
| 171 | "200": { |
| 172 | description: "Success.", |
| 173 | content: { "application/json": { schema: {} } }, |
| 174 | }, |
| 175 | "401": errorResponse("A token is required, or the one sent is not valid."), |
| 176 | "403": errorResponse("Signed in, but not allowed to do this."), |
| 177 | "404": errorResponse("It does not exist, or you cannot see it."), |
| 178 | "409": errorResponse("The request conflicts with the current state."), |
| 179 | "422": errorResponse("The input is not valid."), |
| 180 | }, |
| 181 | }; |
| 182 | } |
| 183 | |
| 184 | return { |
| 185 | openapi: "3.1.0", |
| 186 | info: { |
| 187 | title: "g1t API", |
| 188 | version: "1", |
| 189 | description: |
| 190 | "The REST API for g1t, a git forge built for agents. The same operations are available to agents as MCP tools at https://mcp.g1t.sh.", |
| 191 | license: { name: "MIT", identifier: "MIT" }, |
| 192 | }, |
| 193 | servers: [{ url: "https://api.g1t.sh" }], |
| 194 | security: [{ token: [] }, {}], |
| 195 | tags: [ |
| 196 | { name: "Accounts", description: "Registering and getting a token." }, |
| 197 | { name: "Repositories" }, |
| 198 | { name: "Intents", description: "Goals stated against a repository." }, |
| 199 | { name: "Attempts", description: "An agent's or person's run at an intent." }, |
| 200 | { name: "Sessions", description: "The record of how an attempt was made." }, |
| 201 | ], |
| 202 | paths, |
| 203 | components: { |
| 204 | securitySchemes: { |
| 205 | token: { |
| 206 | type: "http", |
| 207 | scheme: "bearer", |
| 208 | description: "An access token, `g1t_…`. Public data needs none.", |
| 209 | }, |
| 210 | }, |
| 211 | schemas: { |
| 212 | Error: { |
| 213 | type: "object", |
| 214 | required: ["error"], |
| 215 | properties: { |
| 216 | error: { |
| 217 | type: "object", |
| 218 | required: ["code", "message"], |
| 219 | properties: { |
| 220 | code: { |
| 221 | type: "string", |
| 222 | enum: ["unauthenticated", "forbidden", "not_found", "conflict", "invalid"], |
| 223 | }, |
| 224 | message: { type: "string" }, |
| 225 | }, |
| 226 | }, |
| 227 | }, |
| 228 | }, |
| 229 | }, |
| 230 | }, |
| 231 | }; |
| 232 | } |