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TypeScript
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const decodeJson = Schema.decodeUnknownOption(Schema.fromJsonString(Schema.Unknown))const maxErrorBodyChars = 1_024const maxResponseBodyBytes = 50 * 1024 * 1024
export const invoke = (plan: Plan, input: unknown): Effect.Effect<unknown, unknown, HttpClient.HttpClient> => Effect.gen(function* () { const value = isRecord(input) ? input : {}
let request = yield* buildRequest(plan, value)
const auth = yield* resolveAuth(plan) for (const [name, item] of Object.entries(auth.query)) { request = HttpClientRequest.setUrlParam(request, name, item) } request = HttpClientRequest.setHeaders(request, auth.headers)
const client = yield* HttpClient.HttpClient const response = yield* client .execute(request) .pipe( Effect.mapError((cause) => toolError(`${plan.operation.method} ${plan.operation.path} failed: transport error`, cause), ), ) const text = yield* readResponseBody(response, plan) const mediaType = response.headers["content-type"]?.split(";")[0]?.trim().toLowerCase() const json = mediaType === "application/json" || mediaType?.endsWith("+json") === true const decoded = text === "" ? Option.some(null) : json ? decodeJson(text) : Option.none() const parsed = json ? Option.getOrElse(decoded, () => text) : text === "" ? null : text if (response.status < 200 || response.status >= 300) { const rendered = typeof parsed === "string" ? parsed : (JSON.stringify(parsed) ?? "") const summary = rendered === "" || rendered === "null" ? "no response body" : rendered.length > maxErrorBodyChars ? `${rendered.slice(0, maxErrorBodyChars)}...` : rendered return yield* Effect.fail( toolError(`${plan.operation.method} ${plan.operation.path} failed with HTTP ${response.status}: ${summary}`), ) } if (json && Option.isNone(decoded)) { return yield* Effect.fail(toolError(`${plan.operation.method} ${plan.operation.path} returned malformed JSON.`)) } return parsed })
const buildRequest = ( plan: Plan, input: Readonly<Record<string, unknown>>,): Effect.Effect<HttpClientRequest.HttpClientRequest, ToolError> => Effect.gen(function* () { // Validate model input before auth resolution can refresh credentials. const url = buildUrl(plan, input) if (url instanceof ToolError) return yield* Effect.fail(url) const missing = plan.fields.find( (field) => field.required && field.location !== "path" && own(input, field.inputName) === undefined, ) if (missing !== undefined) { const label = missing.location === "body" ? "body field" : `${missing.location} parameter` return yield* Effect.fail(toolError(`Missing required ${label} '${missing.inputName}'.`)) }
let request = HttpClientRequest.make(plan.operation.method as HttpMethod.HttpMethod)(url) const query: Array<readonly [string, string]> = [] for (const field of plan.fields) { if (field.location !== "query") continue const item = own(input, field.inputName) if (item === undefined) continue const serialized = serializeQuery(field, item) if (serialized instanceof ToolError) return yield* Effect.fail(serialized) for (const parameter of serialized) query.push(parameter) } if (query.length > 0) request = HttpClientRequest.appendUrlParams(request, query)
request = HttpClientRequest.setHeaders(request, plan.headers) for (const field of plan.fields) { if (field.location !== "header") continue const item = own(input, field.inputName) if (item === undefined) continue const serialized = serializeSimple(field, item, String) if (serialized instanceof ToolError) return yield* Effect.fail(serialized) request = HttpClientRequest.setHeader(request, field.name, serialized) }
const setBody = (value: unknown, mediaType: string) => HttpClientRequest.bodyJson(request, value).pipe( Effect.map((next) => HttpClientRequest.setHeader(next, "content-type", mediaType)), Effect.mapError((cause) => toolError(`Invalid JSON body for ${plan.operation.method} ${plan.operation.path}.`, cause), ), ) if (plan.body?.mode === "value") { const field = plan.fields.find((field) => field.location === "body") const body = field === undefined ? undefined : own(input, field.inputName) if (body !== undefined) request = yield* setBody(body, plan.body.mediaType) } if (plan.body?.mode === "object") { const entries = plan.fields.flatMap((field) => { if (field.location !== "body") return [] const item = own(input, field.inputName) return item === undefined ? [] : [[field.name, item] as const] }) if (plan.body.required || entries.length > 0) { request = yield* setBody(Object.fromEntries(entries), plan.body.mediaType) } } return request })
const resolveAuth = (plan: Plan): Effect.Effect<AppliedAuth, unknown> => Effect.gen(function* () { const none: AppliedAuth = { headers: {}, query: {} } if (plan.security.length === 0) return none
const unavailable: Array<string> = [] alternatives: for (const requirement of plan.security) { const names = Object.keys(requirement) if (names.length === 0) return none const credentials: Array<readonly [string, SecurityScheme, Credential]> = [] for (const name of names) { const scheme = own(plan.schemes, name) if (scheme === undefined || plan.auth === undefined) { unavailable.push(name) continue alternatives } const credential = yield* plan.auth.resolve({ name, definition: scheme, scopes: requirement[name] ?? [], operation: plan.operation, }) if (credential === undefined) { unavailable.push(name) continue alternatives } credentials.push([name, scheme, credential]) } const applied = applyCredentials(credentials) return applied instanceof ToolError ? yield* Effect.fail(applied) : applied }
return yield* Effect.fail( toolError( `${plan.operation.method} ${plan.operation.path} requires authentication; no credential available for: ${[...new Set(unavailable)].join(", ")}.`, ), ) })
const applyCredentials = ( credentials: ReadonlyArray<readonly [string, SecurityScheme, Credential]>,): AppliedAuth | ToolError => { const headers = new Map<string, string>() const query = new Map<string, string>() const add = (carrier: "header" | "query", name: string, value: string): ToolError | undefined => { const target = carrier === "header" ? headers : query if (target.has(name)) return toolError(`Authentication resolves multiple credentials for ${carrier} '${name}'.`) target.set(name, value) } for (const [name, definition, credential] of credentials) { if (credential.type === "bearer") { const duplicate = add("header", "authorization", `Bearer ${credential.token}`) if (duplicate !== undefined) return duplicate continue } if (credential.type === "basic") { // Basic auth credentials are UTF-8; btoa rejects non-Latin-1 input. const duplicate = add( "header", "authorization", `Basic ${Buffer.from(`${credential.username}:${credential.password}`, "utf8").toString("base64")}`, ) if (duplicate !== undefined) return duplicate continue } if (credential.type === "header") { const duplicate = add("header", credential.name.toLowerCase(), credential.value) if (duplicate !== undefined) return duplicate continue } if (definition.type !== "apiKey") { return toolError( `Security scheme '${name}' is not an apiKey scheme; resolve a bearer, basic, or header credential for it.`, ) } if (definition.in === "cookie") return toolError(`Cookie authentication '${name}' is not supported.`) const parameter = definition.in === "header" ? definition.name.toLowerCase() : definition.name const duplicate = add(definition.in, parameter, credential.value) if (duplicate !== undefined) return duplicate } return { headers: Object.fromEntries(headers), query: Object.fromEntries(query) }}
const buildUrl = (plan: Plan, input: Readonly<Record<string, unknown>>): string | ToolError => { let url = plan.url for (const field of plan.fields) { if (field.location !== "path") continue const item = own(input, field.inputName) if (item === undefined) { return toolError(`Missing required path parameter '${field.inputName}'.`) } const fieldValue = serializeSimple(field, item, (value) => encodeURIComponent(value).replace( /[!'()*]/g, (character) => `%${character.charCodeAt(0).toString(16).toUpperCase()}`, ), ) if (fieldValue instanceof ToolError) return fieldValue // URL normalization collapses encoded `.` and `..`, which could retarget the request. if (fieldValue === "" || fieldValue === "." || fieldValue === "..") { return toolError(`Invalid path parameter '${field.inputName}'.`) } url = url.replaceAll(`{${field.name}}`, fieldValue) } const unresolved = url.match(/\{[^{}]+\}/) if (unresolved !== null) return toolError(`Unresolved path parameter ${unresolved[0]}.`) return url}
const serializeSimple = ( field: Plan["fields"][number], value: unknown, encode: (value: string) => string,): string | ToolError => { const scalar = (item: unknown): string | ToolError => item !== null && typeof item !== "string" && typeof item !== "number" && typeof item !== "boolean" ? toolError(`Parameter '${field.inputName}' contains an unsupported nested value.`) : encode(String(item)) if (Array.isArray(value)) { const items = value.map(scalar) const invalid = items.find((item): item is ToolError => item instanceof ToolError) return invalid ?? items.join(",") } if (!isRecord(value)) return scalar(value) const entries = Object.entries(value).flatMap<string | ToolError>(([name, item]) => { const rendered = scalar(item) if (rendered instanceof ToolError) return [rendered] return field.explode ? [`${encode(name)}=${rendered}`] : [encode(name), rendered] }) const invalid = entries.find((item): item is ToolError => item instanceof ToolError) return invalid ?? entries.join(",")}
const serializeQuery = ( field: Plan["fields"][number], value: unknown,): ReadonlyArray<readonly [string, string]> | ToolError => { if (field.style === "deepObject") { if (!isRecord(value)) return toolError(`Deep-object parameter '${field.inputName}' must be an object.`) const parameters: Array<readonly [string, string]> = [] for (const [name, item] of Object.entries(value)) { if (item === undefined || (item !== null && typeof item === "object")) { return toolError(`Deep-object parameter '${field.inputName}' contains an unsupported nested value.`) } parameters.push([`${field.name}[${name}]`, String(item)]) } return parameters } if (Array.isArray(value)) { if (!field.explode) { const rendered = serializeSimple(field, value, String) return rendered instanceof ToolError ? rendered : [[field.name, rendered]] } const parameters: Array<readonly [string, string]> = [] for (const item of value) { if (item !== null && typeof item !== "string" && typeof item !== "number" && typeof item !== "boolean") { return toolError(`Parameter '${field.inputName}' contains an unsupported nested value.`) } parameters.push([field.name, String(item)]) } return parameters } if (isRecord(value) && field.explode) { const parameters: Array<readonly [string, string]> = [] for (const [name, item] of Object.entries(value)) { if (item === undefined || (item !== null && typeof item === "object")) { return toolError(`Query parameter '${field.inputName}' contains an unsupported nested value.`) } parameters.push([name, String(item)]) } return parameters } const rendered = serializeSimple(field, value, String) return rendered instanceof ToolError ? rendered : [[field.name, rendered]]}
const readResponseBody = ( response: HttpClientResponse.HttpClientResponse, plan: Plan,): Effect.Effect<string, ToolError> => Effect.gen(function* () { const contentLength = response.headers["content-length"] const parsedSize = contentLength === undefined ? undefined : Number.parseInt(contentLength, 10) const declaredSize = parsedSize !== undefined && Number.isSafeInteger(parsedSize) && parsedSize >= 0 ? parsedSize : undefined if (declaredSize !== undefined && declaredSize > maxResponseBodyBytes) { return yield* Effect.fail(toolError(`${plan.operation.method} ${plan.operation.path} response exceeds 50 MiB.`)) } let body = Buffer.allocUnsafe(Math.min(maxResponseBodyBytes, declaredSize ?? 64 * 1024)) let size = 0 yield* Stream.runForEach(response.stream, (chunk) => { if (size + chunk.byteLength > maxResponseBodyBytes) { return Effect.fail(toolError(`${plan.operation.method} ${plan.operation.path} response exceeds 50 MiB.`)) } if (size + chunk.byteLength > body.byteLength) { const grown = Buffer.allocUnsafe( Math.min(maxResponseBodyBytes, Math.max(size + chunk.byteLength, body.byteLength * 2)), ) body.copy(grown, 0, 0, size) body = grown } body.set(chunk, size) size += chunk.byteLength return Effect.void }).pipe( Effect.catch((cause) => { if (cause instanceof ToolError) return Effect.fail(cause) if (cause.reason._tag === "EmptyBodyError") return Effect.void return Effect.fail( toolError(`${plan.operation.method} ${plan.operation.path} failed while reading the response body.`, cause), ) }), ) return new TextDecoder().decode(body.subarray(0, size)) })