feat: add Gatewayz provider support

packages/console/app/src/routes/zen/util/provider/gatewayz.ts

@@ -0,0 +1,62 @@
+import { ProviderHelper, CommonRequest, CommonResponse, CommonChunk } from "./provider"
+
+type Usage = {
+  prompt_tokens?: number
+  completion_tokens?: number
+  total_tokens?: number
+  prompt_tokens_details?: {
+    cached_tokens?: number
+  }
+  completion_tokens_details?: {
+    reasoning_tokens?: number
+  }
+}
+
+export const gatewayzHelper = {
+  format: "oa-compat",
+  modifyUrl: (providerApi: string) => providerApi + "/v1/chat/completions",
+  modifyHeaders: (headers: Headers, body: Record<string, any>, apiKey: string) => {
+    headers.set("authorization", `Bearer ${apiKey}`)
+  },
+  modifyBody: (body: Record<string, any>) => {
+    return {
+      ...body,
+      ...(body.stream ? { stream_options: { include_usage: true } } : {}),
+    }
+  },
+  streamSeparator: "\n\n",
+  createUsageParser: () => {
+    let usage: Usage
+
+    return {
+      parse: (chunk: string) => {
+        if (!chunk.startsWith("data: ")) return
+
+        let json
+        try {
+          json = JSON.parse(chunk.slice(6)) as { usage?: Usage }
+        } catch (e) {
+          return
+        }
+
+        if (!json.usage) return
+        usage = json.usage
+      },
+      retrieve: () => usage,
+    }
+  },
+  normalizeUsage: (usage: Usage) => {
+    const inputTokens = usage.prompt_tokens ?? 0
+    const outputTokens = usage.completion_tokens ?? 0
+    const reasoningTokens = usage.completion_tokens_details?.reasoning_tokens ?? undefined
+    const cacheReadTokens = usage.prompt_tokens_details?.cached_tokens ?? undefined
+    return {
+      inputTokens: inputTokens - (cacheReadTokens ?? 0),
+      outputTokens,
+      reasoningTokens,
+      cacheReadTokens,
+      cacheWrite5mTokens: undefined,
+      cacheWrite1hTokens: undefined,
+    }
+  },
+} satisfies ProviderHelper

packages/console/app/src/routes/zen/util/provider/provider.ts

@@ -23,6 +23,7 @@ import {
   toOaCompatibleRequest,
   toOaCompatibleResponse,
 } from "./openai-compatible"
+import { gatewayzHelper } from "./gatewayz"
 
 export type ProviderHelper = {
   format: ZenData.Format