Add Xiaomi MiMo provider (mimo-v2.5) support

internal/providers/xiaomi.go

@@ -0,0 +1,133 @@
+package providers
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"strings"
+	"time"
+
+	"github.com/go-resty/resty/v2"
+	"gophergate/internal/config"
+	"gophergate/internal/models"
+)
+
+type XiaomiProvider struct {
+	client *resty.Client
+	config config.XiaomiConfig
+	apiKey string
+}
+
+func NewXiaomiProvider(cfg config.XiaomiConfig, apiKey string) *XiaomiProvider {
+	return &XiaomiProvider{
+		client: resty.New().SetTimeout(10 * time.Minute),
+		config: cfg,
+		apiKey: strings.TrimSpace(apiKey),
+	}
+}
+
+func (p *XiaomiProvider) Name() string {
+	return "xiaomi"
+}
+
+func (p *XiaomiProvider) ChatCompletion(ctx context.Context, req *models.UnifiedRequest) (*models.ChatCompletionResponse, error) {
+	messagesJSON, err := MessagesToOpenAIJSON(req.Messages)
+	if err != nil {
+		return nil, fmt.Errorf("failed to convert messages: %w", err)
+	}
+
+	body := BuildOpenAIBody(req, messagesJSON, false)
+
+	baseURL := strings.TrimRight(p.config.BaseURL, "/")
+
+	resp, err := p.client.R().
+		SetContext(ctx).
+		SetHeader("Authorization", "Bearer "+p.apiKey).
+		SetHeader("Content-Type", "application/json").
+		SetHeader("Accept", "application/json").
+		SetBody(body).
+		Post(fmt.Sprintf("%s/chat/completions", baseURL))
+
+	if err != nil {
+		return nil, fmt.Errorf("request failed: %w", err)
+	}
+
+	if !resp.IsSuccess() {
+		msg := resp.String()
+		if msg == "" {
+			if b := resp.Body(); len(b) > 0 {
+				msg = string(b)
+			}
+		}
+		if msg == "" {
+			if body, err := io.ReadAll(resp.RawBody()); err == nil {
+				msg = string(body)
+			}
+		}
+		return nil, fmt.Errorf("Xiaomi API error (%d): %s", resp.StatusCode(), msg)
+	}
+
+	var respJSON map[string]interface{}
+	if err := json.Unmarshal(resp.Body(), &respJSON); err != nil {
+		return nil, fmt.Errorf("failed to parse response: %w", err)
+	}
+
+	return ParseOpenAIResponse(respJSON, req.Model)
+}
+
+func (p *XiaomiProvider) ChatCompletionStream(ctx context.Context, req *models.UnifiedRequest) (<-chan *models.ChatCompletionStreamResponse, error) {
+	messagesJSON, err := MessagesToOpenAIJSON(req.Messages)
+	if err != nil {
+		return nil, fmt.Errorf("failed to convert messages: %w", err)
+	}
+
+	body := BuildOpenAIBody(req, messagesJSON, true)
+
+	baseURL := strings.TrimRight(p.config.BaseURL, "/")
+
+	resp, err := p.client.R().
+		SetContext(ctx).
+		SetHeader("Authorization", "Bearer "+p.apiKey).
+		SetHeader("Content-Type", "application/json").
+		SetHeader("Accept", "text/event-stream").
+		SetBody(body).
+		SetDoNotParseResponse(true).
+		Post(fmt.Sprintf("%s/chat/completions", baseURL))
+
+	if err != nil {
+		return nil, fmt.Errorf("request failed: %w", err)
+	}
+
+	if !resp.IsSuccess() {
+		msg := resp.String()
+		if msg == "" {
+			if body, err := io.ReadAll(resp.RawBody()); err == nil {
+				msg = string(body)
+			}
+		}
+		return nil, fmt.Errorf("Xiaomi API error (%d): %s", resp.StatusCode(), msg)
+	}
+
+	ch := make(chan *models.ChatCompletionStreamResponse)
+	go func() {
+		defer close(ch)
+		if err := StreamOpenAI(resp.RawBody(), ch); err != nil {
+			fmt.Printf("Xiaomi Stream error: %v\n", err)
+		}
+	}()
+
+	return ch, nil
+}
+
+func (p *XiaomiProvider) ImageGeneration(ctx context.Context, req *models.ImageGenerationRequest) (*models.ImageGenerationResponse, error) {
+	return nil, fmt.Errorf("xiaomi does not support image generation")
+}
+
+func (p *XiaomiProvider) Responses(ctx context.Context, req *models.ResponsesRequest) (*models.ResponsesResponse, error) {
+	return nil, fmt.Errorf("responses API not supported by xiaomi")
+}
+
+func (p *XiaomiProvider) ResponsesStream(ctx context.Context, req *models.ResponsesRequest) (<-chan *models.ResponsesStreamChunk, error) {
+	return nil, fmt.Errorf("responses API not supported by xiaomi")
+}