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Custom OpenAI-Compatible Chat Provider\n// Supports any OpenAI-compatible API endpoint with model auto-discovery\nimport type { ChatProvider, ChatMessage, ChatCompletionOptions, ChatCompletionResponse, StreamChunk } from \"./types.ts\";\n\nexport interface CustomProviderConfig {\n baseUrl: string;\n apiKey?: string;\n name?: string;\n}\n\nexport class CustomProvider implements ChatProvider {\n name = \"custom\";\n defaultModel = \"\";\n \n private apiKey: string | undefined;\n private baseUrl = \"\";\n \n constructor(config?: CustomProviderConfig) {\n if (config) {\n this.baseUrl = config.baseUrl;\n this.apiKey = config.apiKey;\n if (config.name) {\n this.name = config.name;\n }\n }\n }\n \n isConfigured(): boolean {\n return !!this.baseUrl;\n }\n \n // Set configuration dynamically\n setConfig(config: CustomProviderConfig): void {\n this.baseUrl = config.baseUrl;\n this.apiKey = config.apiKey;\n if (config.name) {\n this.name = config.name;\n }\n }\n \n async complete(messages: ChatMessage[], options?: ChatCompletionOptions): Promise {\n // Use baseUrl from options if provided\n const baseUrl = options?.baseUrl || this.baseUrl;\n const apiKey = options?.apiKey || this.apiKey;\n \n if (!baseUrl) {\n throw new Error(\"Custom provider base URL not configured. Please add a base URL in the chat settings.\");\n }\n \n const model = options?.model || this.defaultModel;\n if (!model) {\n throw new Error(\"No model specified for custom provider.\");\n }\n \n const temperature = options?.temperature ?? 0.7;\n const maxTokens = options?.maxTokens ?? 2048;\n const topP = options?.topP ?? 1;\n const frequencyPenalty = options?.frequencyPenalty ?? 0;\n const presencePenalty = options?.presencePenalty ?? 0;\n \n // Add system prompt to messages if provided\n const finalMessages = options?.systemPrompt \n ? [{ role: \"system\" as const, content: options.systemPrompt }, ...messages]\n : messages;\n \n // Build request headers\n const headers: Record = {\n \"Content-Type\": \"application/json\",\n };\n \n if (apiKey) {\n headers[\"Authorization\"] = \"Bearer \" + apiKey;\n }\n \n // Build request body (OpenAI-compatible format)\n const requestBody: Record = {\n model,\n messages: finalMessages,\n temperature,\n max_tokens: maxTokens,\n top_p: topP,\n frequency_penalty: frequencyPenalty,\n presence_penalty: presencePenalty,\n stream: false,\n };\n \n // Ensure baseUrl doesn't have trailing slash\n const normalizedBaseUrl = baseUrl.replace(/\\/$/, '');\n \n const response = await fetch(normalizedBaseUrl + \"/chat/completions\", {\n method: \"POST\",\n headers,\n body: JSON.stringify(requestBody),\n });\n \n if (!response.ok) {\n const errorText = await response.text();\n console.error(\"Custom API error:\", response.status, errorText);\n let errorMsg = \"Failed to get response from Custom API\";\n try {\n const errorData = JSON.parse(errorText);\n errorMsg = errorData.error?.message || errorData.message || errorMsg;\n if (response.status === 401 || response.status === 403) {\n errorMsg = \"Custom provider API key is invalid or missing. Please check your API key in Settings → Models.\";\n }\n } catch {\n // If error text isn't JSON, use the status code\n if (response.status === 401 || response.status === 403) {\n errorMsg = \"Custom provider API key is invalid or missing. Please check your API key in Settings → Models.\";\n } else {\n errorMsg = `Custom API error (${response.status}): ${errorText.substring(0, 200)}`;\n }\n }\n throw new Error(errorMsg);\n }\n \n const data = await response.json();\n \n console.log(\"[Custom API complete response]:\", JSON.stringify(data, null, 2));\n \n if (!data.choices || !data.choices[0] || !data.choices[0].message) {\n throw new Error(\"Invalid response from Custom API\");\n }\n \n return {\n content: data.choices[0].message.content,\n role: \"assistant\",\n model: data.model,\n usage: data.usage ? {\n promptTokens: data.usage.prompt_tokens,\n completionTokens: data.usage.completion_tokens,\n totalTokens: data.usage.total_tokens,\n } : undefined,\n };\n }\n \n async *stream(messages: ChatMessage[], options?: ChatCompletionOptions): AsyncIterable {\n const baseUrl = options?.baseUrl || this.baseUrl;\n const apiKey = options?.apiKey || this.apiKey;\n \n if (!baseUrl) {\n throw new Error(\"Custom provider base URL not configured. Please add a base URL in the chat settings.\");\n }\n \n const model = options?.model || this.defaultModel;\n if (!model) {\n throw new Error(\"No model specified for custom provider.\");\n }\n \n const temperature = options?.temperature ?? 0.7;\n const maxTokens = options?.maxTokens ?? 2048;\n const topP = options?.topP ?? 1;\n const frequencyPenalty = options?.frequencyPenalty ?? 0;\n const presencePenalty = options?.presencePenalty ?? 0;\n \n // Add system prompt to messages if provided\n const finalMessages = options?.systemPrompt \n ? [{ role: \"system\" as const, content: options.systemPrompt }, ...messages]\n : messages;\n \n // Build request headers\n const headers: Record = {\n \"Content-Type\": \"application/json\",\n };\n \n if (apiKey) {\n headers[\"Authorization\"] = \"Bearer \" + apiKey;\n }\n \n // Build request body\n const requestBody: Record = {\n model,\n messages: finalMessages,\n temperature,\n max_tokens: maxTokens,\n top_p: topP,\n frequency_penalty: frequencyPenalty,\n presence_penalty: presencePenalty,\n stream: true,\n };\n \n const normalizedBaseUrl = baseUrl.replace(/\\/$/, '');\n \n console.log(\"[Custom stream] Request to:\", normalizedBaseUrl + \"/chat/completions\");\n \n const response = await fetch(normalizedBaseUrl + \"/chat/completions\", {\n method: \"POST\",\n headers,\n body: JSON.stringify(requestBody),\n });\n \n if (!response.ok) {\n const errorText = await response.text();\n console.error(\"[Custom stream] API error:\", response.status, errorText);\n let errorMsg = \"Failed to start stream from Custom API\";\n try {\n const errorData = JSON.parse(errorText);\n errorMsg = errorData.error?.message || errorData.message || errorMsg;\n if (response.status === 401 || response.status === 403) {\n errorMsg = \"Custom provider API key is invalid or missing. Please check your API key in Settings → Models.\";\n }\n } catch {\n // If error text isn't JSON, use the status code\n if (response.status === 401 || response.status === 403) {\n errorMsg = \"Custom provider API key is invalid or missing. Please check your API key in Settings → Models.\";\n } else {\n errorMsg = `Custom API error (${response.status}): ${errorText.substring(0, 200)}`;\n }\n }\n throw new Error(errorMsg);\n }\n \n const reader = response.body?.getReader();\n if (!reader) {\n throw new Error(\"No response body for streaming\");\n }\n \n const decoder = new TextDecoder();\n let buffer = \"\";\n let lineCount = 0;\n \n try {\n while (true) {\n const { done, value } = await reader.read();\n \n if (done) {\n console.log(\"[Custom stream] Reader done\");\n yield { content: \"\", done: true };\n break;\n }\n \n const chunk = decoder.decode(value, { stream: true });\n buffer += chunk;\n const lines = buffer.split(\"\\n\");\n buffer = lines.pop() || \"\";\n \n for (const line of lines) {\n const trimmed = line.trim();\n if (!trimmed) continue;\n \n lineCount++;\n if (lineCount <= 5) {\n console.log(\"[Custom stream] Line \" + lineCount + \":\", trimmed.substring(0, 200));\n }\n \n if (!trimmed.startsWith(\"data: \")) continue;\n \n const data = trimmed.slice(6);\n if (data === \"[DONE]\") {\n yield { content: \"\", done: true };\n return;\n }\n \n try {\n const parsed = JSON.parse(data);\n \n if (parsed.error) {\n const errorMsg = parsed.error?.message || JSON.stringify(parsed.error) || \"Unknown streaming error\";\n console.error(\"[Custom stream] API error:\", errorMsg);\n throw new Error(\"Custom API error: \" + errorMsg);\n }\n \n const choice = parsed.choices?.[0];\n const delta = choice?.delta || {};\n \n if (delta.content || choice?.finish_reason) {\n yield { \n content: delta.content || \"\", \n done: false, \n raw: parsed,\n finishReason: choice?.finish_reason,\n };\n }\n } catch (e) {\n if (e instanceof Error && e.message.startsWith(\"Custom API error:\")) {\n throw e;\n }\n console.error(\"[Custom stream] JSON parse error:\", e, \"data:\", data.substring(0, 100));\n }\n }\n }\n } finally {\n console.log(\"[Custom stream] Total lines processed:\", lineCount);\n reader.releaseLock();\n }\n }\n \n // List available models from the API (auto-discovery)\n async listModels(baseUrl?: string, apiKey?: string): Promise> {\n const url = baseUrl || this.baseUrl;\n const key = apiKey || this.apiKey;\n \n if (!url) {\n throw new Error(\"Base URL required to list models\");\n }\n \n const normalizedBaseUrl = url.replace(/\\/$/, '');\n \n const headers: Record = {};\n if (key) {\n headers[\"Authorization\"] = \"Bearer \" + key;\n }\n \n const response = await fetch(normalizedBaseUrl + \"/models\", {\n headers,\n });\n \n if (!response.ok) {\n const errorText = await response.text();\n throw new Error(\"Failed to list models: \" + response.status + \" - \" + errorText);\n }\n \n const data = await response.json();\n \n // Handle both OpenAI format { data: [...] } and simple array format [...]\n const modelList = data.data || data || [];\n \n return modelList.map((m: { id: string; name?: string; owned_by?: string }) => ({\n id: m.id,\n name: m.name || m.id,\n owned_by: m.owned_by,\n }));\n }\n}\n\n// Singleton instance for simple use cases\nexport const customProvider = new CustomProvider();\n\n","deleted","label",[169,170,151],"backend","providers","permalink","https://www.val.town/x/yawnxyz/chat/code/backend/providers/custom.ts","extension","actionData","errors"]