g1t/services/models/src/route.ts
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| Integrations: your own model provider, alerts that open issues, tickets agents read | 1 | import type { ModelUpstream } from "@g1t/contracts"; |
| 2 | ||
| 3 | /** g1t's own way to the models, for runs it pays for. */ | |
| 4 | export type HostedRouting = { | |
| 5 | /** A Cloudflare AI Gateway id; empty sends requests to Anthropic directly. */ | |
| 6 | AI_GATEWAY_ID: string; | |
| 7 | CLOUDFLARE_ACCOUNT_ID: string; | |
| 8 | /** Authenticates to the gateway, which holds g1t's key. */ | |
| 9 | AI_GATEWAY_TOKEN?: string; | |
| 10 | /** g1t's key, when the gateway does not hold it. */ | |
| 11 | ANTHROPIC_API_KEY?: string; | |
| 12 | }; | |
| 13 | ||
| 14 | /** Headers the sandbox sends that never go further. */ | |
| 15 | const DROPPED = new Set([ | |
| 16 | "x-api-key", | |
| 17 | "authorization", | |
| 18 | "host", | |
| 19 | "cf-aig-authorization", | |
| 20 | "cf-aig-metadata", | |
| 21 | "cf-connecting-ip", | |
| 22 | "x-forwarded-for", | |
| 23 | "x-real-ip", | |
| 24 | ]); | |
| 25 | ||
| 26 | /** The token a sandbox sends instead of a key, from either header. */ | |
| 27 | export function presentedToken(headers: Headers): string | null { | |
| 28 | const key = headers.get("x-api-key"); | |
| 29 | if (key) return key.trim(); | |
| 30 | const bearer = headers.get("authorization")?.match(/^Bearer\s+(.+)$/i); | |
| 31 | return bearer ? bearer[1].trim() : null; | |
| 32 | } | |
| 33 | ||
| 34 | /** | |
| 35 | * Where one request goes and what it carries: the sandbox's request, | |
| 36 | * stripped of its token, with the credentials for the run's route. | |
| 37 | * `path` is what follows `/anthropic`, such as `/v1/messages?beta=true`. | |
| 38 | */ | |
| 39 | export function upstreamRequest( | |
| 40 | upstream: ModelUpstream, | |
| 41 | hosted: HostedRouting, | |
| 42 | path: string, | |
| 43 | incoming: Headers, | |
| 44 | ): { url: string; headers: Headers } { | |
| 45 | const headers = new Headers(); | |
| 46 | for (const [name, value] of incoming) { | |
| 47 | if (!DROPPED.has(name.toLowerCase())) headers.set(name, value); | |
| 48 | } | |
| 49 | if (upstream.route === "g1t") { | |
| 50 | if (!hosted.AI_GATEWAY_ID) { | |
| 51 | if (hosted.ANTHROPIC_API_KEY) headers.set("x-api-key", hosted.ANTHROPIC_API_KEY); | |
| 52 | return { url: `https://api.anthropic.com${path}`, headers }; | |
| 53 | } | |
| 54 | // The gateway logs these with every request, so spend and failures can | |
| 55 | // be read per kind of work, workspace, repository and pull request. | |
| 56 | headers.set( | |
| 57 | "cf-aig-metadata", | |
| 58 | JSON.stringify({ task: upstream.task, workspace: upstream.workspace, repo: upstream.repo, pull: upstream.number }), | |
| 59 | ); | |
| 60 | if (hosted.AI_GATEWAY_TOKEN) headers.set("cf-aig-authorization", `Bearer ${hosted.AI_GATEWAY_TOKEN}`); | |
| 61 | if (hosted.ANTHROPIC_API_KEY) headers.set("x-api-key", hosted.ANTHROPIC_API_KEY); | |
| 62 | return { | |
| 63 | url: `https://gateway.ai.cloudflare.com/v1/${hosted.CLOUDFLARE_ACCOUNT_ID}/${hosted.AI_GATEWAY_ID}/anthropic${path}`, | |
| 64 | headers, | |
| 65 | }; | |
| 66 | } | |
| 67 | const key = upstream.apiKey; | |
| 68 | if (key) { | |
| A catalogue of model providers, and settings that feel like settings | 69 | const header = upstream.authHeader ?? "x-api-key"; |
| 70 | headers.set(header, header === "authorization" ? `Bearer ${key}` : key); | |
| Integrations: your own model provider, alerts that open issues, tickets agents read | 71 | } |
| Model providers: gateway tokens for endpoints, tidier rows, and the docs | 72 | if (upstream.gatewayToken) headers.set("cf-aig-authorization", `Bearer ${upstream.gatewayToken}`); |
| Integrations: your own model provider, alerts that open issues, tickets agents read | 73 | const base = (upstream.baseUrl ?? "https://api.anthropic.com").replace(/\/+$/, ""); |
| 74 | return { url: `${base}${path}`, headers }; | |
| 75 | } |