1package provider
2
3// Extra third-party providers.
4//
5// Most are OpenAI Chat Completions–compatible, so they reuse `openaiClient`
6// with a different name + base URL. A handful speak the Anthropic Messages
7// API and reuse `anthropicClient` via NewAnthropicCompat below.
8//
9// Providers with a non-trivial protocol (Bedrock Converse, Vertex SSE, Azure
10// Responses, Mistral Conversations) are stubbed so the host wiring compiles.
11// Filling those in is its own work — Bedrock needs SigV4 + Converse stream
12// parsing, Vertex needs ADC, Azure needs the Responses API shape, Mistral
13// needs its bespoke Conversations API.
14
15import (
16 "context"
17 "fmt"
18 "net/http"
19 "os"
20 "strings"
21)
22
23// ----------------------------------------------------------------------
24// OpenAI Chat Completions–compatible providers. All of these just route
25// Chat Completions to a different base URL with a different name. The
26// default Authorization: Bearer header from openaiClient is correct for
27// every one of them.
28// ----------------------------------------------------------------------
29
30// NewOpenAICompat is the shared constructor for OpenAI-completions clones.
31// Exported so build.go can instantiate clients for user-defined providers.
32func NewOpenAICompat(name, apiKey, baseURL, fallbackBaseURL string) Client {
33 if baseURL == "" {
34 baseURL = fallbackBaseURL
35 }
36 return &openaiClient{
37 apiKey: apiKey,
38 baseURL: strings.TrimRight(baseURL, "/"),
39 name: name,
40 http: &http.Client{Timeout: 0},
41 }
42}
43
44// NewMoonshot is the global Moonshot AI endpoint (Kimi-K2 family by id).
45// Provider id is `moonshotai`.
46func NewMoonshot(apiKey, baseURL string) Client {
47 return NewOpenAICompat("moonshotai", apiKey, baseURL, "https://api.moonshot.ai/v1")
48}
49
50// NewMoonshotCN is the China-region Moonshot endpoint. Same model ids as
51// the global flavor, different base URL.
52func NewMoonshotCN(apiKey, baseURL string) Client {
53 return NewOpenAICompat("moonshotai-cn", apiKey, baseURL, "https://api.moonshot.cn/v1")
54}
55
56// NewCerebras: ultra-fast inference (Llama/Qwen/GPT-OSS/GLM).
57func NewCerebras(apiKey, baseURL string) Client {
58 return NewOpenAICompat("cerebras", apiKey, baseURL, "https://api.cerebras.ai/v1")
59}
60
61// NewGroq: LPU inference (Llama/Kimi/Qwen/GPT-OSS).
62func NewGroq(apiKey, baseURL string) Client {
63 return NewOpenAICompat("groq", apiKey, baseURL, "https://api.groq.com/openai/v1")
64}
65
66// NewXAI: xAI Grok.
67func NewXAI(apiKey, baseURL string) Client {
68 return NewOpenAICompat("xai", apiKey, baseURL, "https://api.x.ai/v1")
69}
70
71// NewTogether: Together.ai aggregator.
72func NewTogether(apiKey, baseURL string) Client {
73 return NewOpenAICompat("together", apiKey, baseURL, "https://api.together.ai/v1")
74}
75
76// NewHuggingFace: HF inference router.
77func NewHuggingFace(apiKey, baseURL string) Client {
78 return NewOpenAICompat("huggingface", apiKey, baseURL, "https://router.huggingface.co/v1")
79}
80
81// NewZAI: Z.AI GLM family.
82func NewZAI(apiKey, baseURL string) Client {
83 return NewOpenAICompat("zai", apiKey, baseURL, "https://api.z.ai/api/coding/paas/v4")
84}
85
86// NewXiaomi: Xiaomi MiMo family (default endpoint).
87func NewXiaomi(apiKey, baseURL string) Client {
88 return NewOpenAICompat("xiaomi", apiKey, baseURL, "https://api.xiaomimimo.com/v1")
89}
90
91// NewXiaomiTokenPlan creates a regional Xiaomi token-plan client.
92// region must be "ams", "cn", or "sgp", matching the three
93// `xiaomi-token-plan-*` provider ids.
94func NewXiaomiTokenPlan(region, apiKey, baseURL string) Client {
95 var fallback string
96 var name string
97 switch region {
98 case "ams":
99 fallback = "https://token-plan-ams.xiaomimimo.com/v1"
100 name = "xiaomi-token-plan-ams"
101 case "cn":
102 fallback = "https://token-plan-cn.xiaomimimo.com/v1"
103 name = "xiaomi-token-plan-cn"
104 case "sgp":
105 fallback = "https://token-plan-sgp.xiaomimimo.com/v1"
106 name = "xiaomi-token-plan-sgp"
107 default:
108 panic(fmt.Sprintf("xiaomi token-plan: unknown region %q", region))
109 }
110 return NewOpenAICompat(name, apiKey, baseURL, fallback)
111}
112
113// NewOpenRouter: OpenRouter aggregator. Unlocks dozens of upstream
114// models with one key.
115func NewOpenRouter(apiKey, baseURL string) Client {
116 return NewOpenAICompat("openrouter", apiKey, baseURL, openrouterDefaultBaseURL)
117}
118
119// NewOpenCode is the opencode.ai Zen endpoint. Mixed APIs upstream; this
120// constructor wires the openai-completions flavor only. Models that need
121// the anthropic-messages flavor under the same provider should be built
122// with NewAnthropicCompat against the same base URL.
123func NewOpenCode(apiKey, baseURL string) Client {
124 return NewOpenAICompat("opencode", apiKey, baseURL, "https://opencode.ai/zen/v1")
125}
126
127// NewOpenCodeGo routes each model through the wire API exposed by OpenCode Go.
128func NewOpenCodeGo(apiKey, baseURL string) Client {
129 const defaultBaseURL = "https://opencode.ai/zen/go/v1"
130 return NewModelRouter("opencode-go",
131 NewOpenAICompat("opencode-go", apiKey, baseURL, defaultBaseURL),
132 map[string]Client{
133 APIResponses: NewOpenAIResponsesNamed(apiKey, firstNonEmptyString(baseURL, defaultBaseURL), "opencode-go"),
134 })
135}
136
137// NewMinimaxOpenAI is the OpenAI-completions flavor of MiniMax, in case
138// downstream models switch from anthropic-messages. The main MiniMax route
139// uses anthropic-messages; see NewMinimaxAnthropic below.
140func NewMinimaxOpenAI(apiKey, baseURL string) Client {
141 return NewOpenAICompat("minimax", apiKey, baseURL, "https://api.minimax.io/v1")
142}
143
144// NewMinimaxCNOpenAI is the CN-region MiniMax (openai-completions).
145func NewMinimaxCNOpenAI(apiKey, baseURL string) Client {
146 return NewOpenAICompat("minimax-cn", apiKey, baseURL, "https://api.minimaxi.com/v1")
147}
148
149// NewFireworksOpenAI is the OpenAI-completions flavor of Fireworks.
150// The main route uses the anthropic-messages variant on
151// api.fireworks.ai/inference; see NewFireworksAnthropic.
152func NewFireworksOpenAI(apiKey, baseURL string) Client {
153 return NewOpenAICompat("fireworks", apiKey, baseURL, "https://api.fireworks.ai/inference/v1")
154}
155
156// NewVercelGatewayOpenAI is Vercel AI Gateway's OpenAI-compat shim. The
157// main route uses anthropic-messages; see NewVercelGatewayAnthropic.
158func NewVercelGatewayOpenAI(apiKey, baseURL string) Client {
159 return NewOpenAICompat("vercel-ai-gateway", apiKey, baseURL, "https://ai-gateway.vercel.sh/v1")
160}
161
162// ----------------------------------------------------------------------
163// Anthropic Messages–compatible providers. These speak Anthropic's wire
164// format but live behind a third party's base URL. They reuse
165// anthropicClient with a custom name.
166// ----------------------------------------------------------------------
167
168// NewAnthropicCompat returns an anthropicClient pinned to a non-default
169// base URL and identifying as `name` for cost / logging purposes. Auth is
170// API key (x-api-key header). For OAuth-fronted compatibles (rare) use
171// NewAnthropicOAuth and rename via NameClient.
172func NewAnthropicCompat(name, apiKey, baseURL string) Client {
173 if baseURL == "" {
174 baseURL = anthropicDefaultBaseURL
175 }
176 return &anthropicClient{
177 apiKey: apiKey,
178 baseURL: strings.TrimRight(baseURL, "/"),
179 name: name,
180 http: &http.Client{Timeout: 0},
181 }
182}
183
184// NewKimiCoding is the Kimi Code client: Kimi behind the Anthropic
185// Messages API at https://api.kimi.com/coding. Replaces the older
186// OpenAI-completions-on-/coding/v1 wiring.
187func NewKimiCoding(apiKey, baseURL string) Client {
188 return NewKimiCodingWithHeaders(apiKey, baseURL, nil)
189}
190
191// NewKimiCodingWithHeaders is the headered variant used by OAuth.
192func NewKimiCodingWithHeaders(apiKey, baseURL string, headers map[string]string) Client {
193 if baseURL == "" {
194 baseURL = "https://api.kimi.com/coding"
195 }
196 return &anthropicClient{
197 apiKey: apiKey,
198 baseURL: strings.TrimRight(baseURL, "/"),
199 name: "kimi",
200 headers: headers,
201 http: &http.Client{Timeout: 0},
202 }
203}
204
205// NewMinimaxAnthropic is the anthropic-messages flavor on
206// api.minimax.io/anthropic, catalogued under provider=minimax.
207func NewMinimaxAnthropic(apiKey, baseURL string) Client {
208 return NewAnthropicCompat("minimax", apiKey, firstNonEmptyString(baseURL, "https://api.minimax.io/anthropic"))
209}
210
211// NewMinimaxCNAnthropic is the CN-region MiniMax (anthropic-messages).
212func NewMinimaxCNAnthropic(apiKey, baseURL string) Client {
213 return NewAnthropicCompat("minimax-cn", apiKey, firstNonEmptyString(baseURL, "https://api.minimaxi.com/anthropic"))
214}
215
216// NewFireworksAnthropic is the main Fireworks route. The
217// anthropic-messages-compatible endpoint at api.fireworks.ai/inference
218// expects Anthropic-style request bodies; use this rather than the
219// OpenAI flavor.
220func NewFireworksAnthropic(apiKey, baseURL string) Client {
221 return NewAnthropicCompat("fireworks", apiKey, firstNonEmptyString(baseURL, "https://api.fireworks.ai/inference"))
222}
223
224// NewVercelGatewayAnthropic — Vercel AI Gateway anthropic-messages route.
225func NewVercelGatewayAnthropic(apiKey, baseURL string) Client {
226 return NewAnthropicCompat("vercel-ai-gateway", apiKey, firstNonEmptyString(baseURL, "https://ai-gateway.vercel.sh"))
227}
228
229// ----------------------------------------------------------------------
230// Stubbed providers — bigger protocol surface, follow-up work.
231// ----------------------------------------------------------------------
232
233type unimplementedClient struct {
234 name string
235 hint string
236}
237
238func (c *unimplementedClient) Name() string { return c.name }
239
240func (c *unimplementedClient) Stream(ctx context.Context, req Request) (<-chan Event, error) {
241 if err := ValidateFastMode(c.Name(), req.FastMode); err != nil {
242 return nil, err
243 }
244 return nil, fmt.Errorf("provider %q not yet implemented: %s", c.name, c.hint)
245}
246
247// NewBedrock returns an AWS Bedrock client. See amazon_bedrock.go for the
248// hand-rolled Converse-Stream wire-format parser. Auth is via
249// AWS_BEARER_TOKEN_BEDROCK (the modern Bedrock API key flow); SigV4
250// signing for IAM access-key + secret credentials is not yet wired.
251func NewBedrock(apiKey, baseURL string) Client {
252 return NewBedrockClient(apiKey, baseURL)
253}
254
255// NewGoogleVertex returns a Vertex AI client. See google_vertex.go for
256// the full auth + URL-rewrite implementation. Requires GOOGLE_CLOUD_PROJECT,
257// GOOGLE_CLOUD_LOCATION, and either GOOGLE_CLOUD_API_KEY or a service-
258// account JSON file pointed to by GOOGLE_APPLICATION_CREDENTIALS (or the
259// default ADC location ~/.config/gcloud/application_default_credentials.json).
260func NewGoogleVertex(apiKey, baseURL string) Client {
261 return NewVertex(apiKey, baseURL)
262}
263
264// NewMistral returns a Mistral client using their OpenAI-compatible Chat
265// Completions endpoint at https://api.mistral.ai/v1. Mistral also offers a
266// bespoke "Conversations" API, but the OpenAI-compat endpoint supports
267// the same models with tool calling and streaming, so we use that for
268// simplicity (no extra wire format to maintain).
269func NewMistral(apiKey, baseURL string) Client {
270 return NewOpenAICompat("mistral", apiKey, baseURL, "https://api.mistral.ai/v1")
271}
272
273// Cloudflare endpoints carry `{CLOUDFLARE_ACCOUNT_ID}` and (for the AI
274// Gateway) `{CLOUDFLARE_GATEWAY_ID}` placeholders that we substitute
275// from env vars at client-construction time. Workers AI uses standard
276// `Authorization: Bearer <key>`; AI Gateway uses `cf-aig-authorization`
277// (the upstream Authorization header is passed through to whichever
278// downstream provider the gateway forwards to).
279
280func resolveCloudflareURL(template string) (string, error) {
281 out := template
282 for _, key := range []string{"CLOUDFLARE_ACCOUNT_ID", "CLOUDFLARE_GATEWAY_ID"} {
283 placeholder := "{" + key + "}"
284 if !strings.Contains(out, placeholder) {
285 continue
286 }
287 v := os.Getenv(key)
288 if v == "" {
289 return "", fmt.Errorf("%s is required but not set in env", key)
290 }
291 out = strings.ReplaceAll(out, placeholder, v)
292 }
293 return out, nil
294}
295
296// NewCloudflareWorkersAI returns an OpenAI-compatible client pinned to
297// the Workers AI base URL with {CLOUDFLARE_ACCOUNT_ID} substituted.
298// Returns an erroring client (deferred error on first Stream call) if
299// the env var is missing, so the constructor signature stays the same.
300func NewCloudflareWorkersAI(apiKey, baseURL string) Client {
301 if baseURL == "" {
302 baseURL = "https://api.cloudflare.com/client/v4/accounts/{CLOUDFLARE_ACCOUNT_ID}/ai/v1"
303 }
304 resolved, err := resolveCloudflareURL(baseURL)
305 if err != nil {
306 return &unimplementedClient{name: "cloudflare-workers-ai", hint: err.Error()}
307 }
308 return NewOpenAICompat("cloudflare-workers-ai", apiKey, resolved, "")
309}
310
311// NewCloudflareAIGateway returns the AI Gateway client (OpenAI compat
312// route). Sends `cf-aig-authorization` instead of `Authorization` so
313// the gateway authenticates the caller (downstream-provider auth is
314// configured per-gateway in the Cloudflare dashboard).
315func NewCloudflareAIGateway(apiKey, baseURL string) Client {
316 if baseURL == "" {
317 baseURL = "https://gateway.ai.cloudflare.com/v1/{CLOUDFLARE_ACCOUNT_ID}/{CLOUDFLARE_GATEWAY_ID}/compat"
318 }
319 resolved, err := resolveCloudflareURL(baseURL)
320 if err != nil {
321 return &unimplementedClient{name: "cloudflare-ai-gateway", hint: err.Error()}
322 }
323 return &openaiClient{
324 apiKey: apiKey,
325 baseURL: strings.TrimRight(resolved, "/"),
326 name: "cloudflare-ai-gateway",
327 headers: map[string]string{"cf-aig-authorization": "Bearer " + apiKey},
328 http: &http.Client{Timeout: 0},
329 }
330}
331
332// NewGithubCopilot returns a GitHub Copilot client. The provided
333// credential must be a GitHub Personal Access Token (PAT) with Copilot
334// access enabled; zut trades it for a short-lived Copilot token on
335// every inference request (cached in memory until ~5min before expiry).
336//
337// Wire format: OpenAI Chat Completions. Copilot-specific headers
338// (X-Initiator, Openai-Intent, Editor-Version, Editor-Plugin-Version,
339// Copilot-Integration-Id, User-Agent) are added by the refresh
340// transport. The model id passes through unchanged.
341//
342// baseURL is ignored: the canonical host is read from `proxy-ep=...` in
343// the short-lived token's value.
344func NewGithubCopilot(apiKey, _ string) Client {
345 if apiKey == "" {
346 return &unimplementedClient{name: "github-copilot", hint: "set COPILOT_GITHUB_TOKEN"}
347 }
348 return NewGithubCopilotClient(apiKey)
349}
350
351// ----------------------------------------------------------------------
352// helpers
353// ----------------------------------------------------------------------
354
355func firstNonEmptyString(vals ...string) string {
356 for _, v := range vals {
357 if v != "" {
358 return v
359 }
360 }
361 return ""
362}