File size: 3,849 Bytes
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import (
"crypto/sha256"
"encoding/binary"
"encoding/json"
"fmt"
"net/http"
"strings"
"ds2api/internal/auth"
"ds2api/internal/chathistory"
"ds2api/internal/config"
"ds2api/internal/httpapi/openai/shared"
"ds2api/internal/util"
)
type Handler struct {
Store shared.ConfigReader
Auth shared.AuthResolver
DS shared.DeepSeekCaller
ChatHistory *chathistory.Store
}
func (h *Handler) Embeddings(w http.ResponseWriter, r *http.Request) {
a, err := h.Auth.Determine(r)
if err != nil {
status := http.StatusUnauthorized
detail := err.Error()
if err == auth.ErrNoAccount {
status = http.StatusTooManyRequests
}
shared.WriteOpenAIError(w, status, detail)
return
}
defer h.Auth.Release(a)
r.Body = http.MaxBytesReader(w, r.Body, shared.GeneralMaxSize)
var req map[string]any
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
if strings.Contains(strings.ToLower(err.Error()), "too large") {
shared.WriteOpenAIError(w, http.StatusRequestEntityTooLarge, "request body too large")
return
}
shared.WriteOpenAIError(w, http.StatusBadRequest, "invalid json")
return
}
model, _ := req["model"].(string)
model = strings.TrimSpace(model)
if model == "" {
shared.WriteOpenAIError(w, http.StatusBadRequest, "Request must include 'model'.")
return
}
if _, ok := config.ResolveModel(h.Store, model); !ok {
shared.WriteOpenAIError(w, http.StatusBadRequest, fmt.Sprintf("Model '%s' is not available.", model))
return
}
inputs := ExtractEmbeddingInputs(req["input"])
if len(inputs) == 0 {
shared.WriteOpenAIError(w, http.StatusBadRequest, "Request must include non-empty 'input'.")
return
}
provider := ""
if h.Store != nil {
provider = strings.ToLower(strings.TrimSpace(h.Store.EmbeddingsProvider()))
}
if provider == "" {
shared.WriteOpenAIError(w, http.StatusNotImplemented, "Embeddings provider is not configured. Set embeddings.provider in config.")
return
}
switch provider {
case "mock", "deterministic", "builtin":
// supported local deterministic provider
default:
shared.WriteOpenAIError(w, http.StatusNotImplemented, fmt.Sprintf("Embeddings provider '%s' is not supported.", provider))
return
}
data := make([]map[string]any, 0, len(inputs))
totalTokens := 0
for i, input := range inputs {
totalTokens += util.EstimateTokens(input)
data = append(data, map[string]any{
"object": "embedding",
"index": i,
"embedding": DeterministicEmbedding(input),
})
}
shared.WriteJSON(w, http.StatusOK, map[string]any{
"object": "list",
"data": data,
"model": model,
"usage": map[string]any{
"prompt_tokens": totalTokens,
"total_tokens": totalTokens,
},
})
}
func ExtractEmbeddingInputs(raw any) []string {
switch v := raw.(type) {
case string:
s := strings.TrimSpace(v)
if s == "" {
return nil
}
return []string{s}
case []any:
out := make([]string, 0, len(v))
for _, item := range v {
switch iv := item.(type) {
case string:
s := strings.TrimSpace(iv)
if s != "" {
out = append(out, s)
}
case []any:
// Token array input support: convert to stable string form.
out = append(out, fmt.Sprintf("%v", iv))
default:
s := strings.TrimSpace(fmt.Sprintf("%v", iv))
if s != "" {
out = append(out, s)
}
}
}
return out
default:
return nil
}
}
func DeterministicEmbedding(input string) []float64 {
// Keep response shape stable without external dependencies.
const dims = 64
out := make([]float64, dims)
seed := sha256.Sum256([]byte(input))
buf := seed[:]
for i := 0; i < dims; i++ {
if len(buf) < 4 {
next := sha256.Sum256(buf)
buf = next[:]
}
v := binary.BigEndian.Uint32(buf[:4])
buf = buf[4:]
// map [0, 2^32) -> [-1, 1]
out[i] = (float64(v)/2147483647.5 - 1.0)
}
return out
}
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