Pick any line to see why it is the way it is: the commit, the pull request and issue it came from, and what the agent was thinking.
| The sidebar asks billing whether it is on, not for the account, so no page waits on the card processor | 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; | |
| AI Gateway: OpenAI's format, open models, and your own providers | 12 | /** |
| 13 | * A Cloudflare API token that may run Workers AI on g1t's account, for | |
| 14 | * the AI Gateway's open models. Without one, `AI_GATEWAY_TOKEN` is tried. | |
| 15 | */ | |
| 16 | WORKERS_AI_TOKEN?: string; | |
| The sidebar asks billing whether it is on, not for the account, so no page waits on the card processor | 17 | }; |
| 18 | ||
| 19 | /** Headers the sandbox sends that never go further. */ | |
| 20 | const DROPPED = new Set([ | |
| 21 | "x-api-key", | |
| 22 | "authorization", | |
| 23 | "host", | |
| 24 | "cf-aig-authorization", | |
| 25 | "cf-aig-metadata", | |
| 26 | "cf-connecting-ip", | |
| 27 | "x-forwarded-for", | |
| 28 | "x-real-ip", | |
| 29 | ]); | |
| 30 | ||
| 31 | /** The token a sandbox sends instead of a key, from either header. */ | |
| 32 | export function presentedToken(headers: Headers): string | null { | |
| 33 | const key = headers.get("x-api-key"); | |
| 34 | if (key) return key.trim(); | |
| 35 | const bearer = headers.get("authorization")?.match(/^Bearer\s+(.+)$/i); | |
| 36 | return bearer ? bearer[1].trim() : null; | |
| 37 | } | |
| 38 | ||
| 39 | /** | |
| Merge the AI Gateway: Anthropic's Messages API on a workspace's tokens | 40 | * The caller's headers, less its token and anything that never goes |
| 41 | * further. Every `cf-aig-` header is the proxy's to set: one from a caller | |
| 42 | * could change how Cloudflare's AI Gateway logs, caches or prices a | |
| 43 | * request (`cf-aig-custom-cost`), which billing settles by. | |
| 44 | */ | |
| 45 | export function passedHeaders(incoming: Headers): Headers { | |
| 46 | const headers = new Headers(); | |
| 47 | for (const [name, value] of incoming) { | |
| 48 | const lower = name.toLowerCase(); | |
| 49 | if (!DROPPED.has(lower) && !lower.startsWith("cf-aig-")) headers.set(name, value); | |
| 50 | } | |
| 51 | return headers; | |
| 52 | } | |
| 53 | ||
| 54 | /** | |
| The sidebar asks billing whether it is on, not for the account, so no page waits on the card processor | 55 | * Where one request goes and what it carries: the sandbox's request, |
| 56 | * stripped of its token, with the credentials for the run's route. | |
| 57 | * `path` is what follows `/anthropic`, such as `/v1/messages?beta=true`. | |
| 58 | */ | |
| 59 | export function upstreamRequest( | |
| 60 | upstream: ModelUpstream, | |
| 61 | hosted: HostedRouting, | |
| 62 | path: string, | |
| 63 | incoming: Headers, | |
| 64 | ): { url: string; headers: Headers } { | |
| Merge the AI Gateway: Anthropic's Messages API on a workspace's tokens | 65 | const headers = passedHeaders(incoming); |
| The sidebar asks billing whether it is on, not for the account, so no page waits on the card processor | 66 | if (upstream.route === "g1t") { |
| 67 | if (!hosted.AI_GATEWAY_ID) { | |
| 68 | if (hosted.ANTHROPIC_API_KEY) headers.set("x-api-key", hosted.ANTHROPIC_API_KEY); | |
| 69 | return { url: `https://api.anthropic.com${path}`, headers }; | |
| 70 | } | |
| 71 | // The gateway logs these with every request, so spend and failures can | |
| 72 | // be read per kind of work, tier, repository and pull request. It keeps | |
| 73 | // five entries and drops the rest, so the tier takes the workspace's | |
| 74 | // place: the repository names the workspace too. A run from before | |
| 75 | // routing by tier has no tier, and keeps the workspace. | |
| 76 | headers.set( | |
| 77 | "cf-aig-metadata", | |
| 78 | JSON.stringify({ | |
| 79 | task: upstream.task, | |
| 80 | ...(upstream.tier ? { tier: upstream.tier } : { workspace: upstream.workspace }), | |
| 81 | repo: upstream.repo, | |
| 82 | pull: upstream.number, | |
| 83 | // What billing finds the run's requests by, to charge what they cost. | |
| 84 | session: upstream.session, | |
| 85 | }), | |
| 86 | ); | |
| 87 | if (hosted.AI_GATEWAY_TOKEN) headers.set("cf-aig-authorization", `Bearer ${hosted.AI_GATEWAY_TOKEN}`); | |
| 88 | if (hosted.ANTHROPIC_API_KEY) headers.set("x-api-key", hosted.ANTHROPIC_API_KEY); | |
| 89 | return { | |
| 90 | url: `https://gateway.ai.cloudflare.com/v1/${hosted.CLOUDFLARE_ACCOUNT_ID}/${hosted.AI_GATEWAY_ID}/anthropic${path}`, | |
| 91 | headers, | |
| 92 | }; | |
| 93 | } | |
| 94 | const key = upstream.apiKey; | |
| 95 | if (key) { | |
| 96 | const header = upstream.authHeader ?? "x-api-key"; | |
| 97 | headers.set(header, header === "authorization" ? `Bearer ${key}` : key); | |
| 98 | } | |
| 99 | if (upstream.gatewayToken) headers.set("cf-aig-authorization", `Bearer ${upstream.gatewayToken}`); | |
| 100 | const base = (upstream.baseUrl ?? "https://api.anthropic.com").replace(/\/+$/, ""); | |
| 101 | return { url: `${base}${path}`, headers }; | |
| 102 | } |
This file's history is long; its oldest lines are credited to the oldest commit read.