sync: migrate ai-operator to Gitea (2026-08-10)

internal/embedding/fake.go

@@ -0,0 +1,54 @@
+package embedding
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/binary"
+	"math"
+)
+
+type FakeProvider struct {
+	dims  int
+	model string
+}
+
+func NewFakeProvider(dims int, model string) *FakeProvider {
+	if dims <= 0 {
+		dims = 1536
+	}
+	if model == "" {
+		model = "fake"
+	}
+	return &FakeProvider{dims: dims, model: model}
+}
+func (p *FakeProvider) Dimensions() int      { return p.dims }
+func (p *FakeProvider) Model() string        { return p.model }
+func (p *FakeProvider) ProviderName() string { return "fake" }
+func (p *FakeProvider) Embed(ctx context.Context, input []string) ([]Vector, error) {
+	out := make([]Vector, 0, len(input))
+	for _, text := range input {
+		select {
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		default:
+		}
+		v := make(Vector, p.dims)
+		seed := sha256.Sum256([]byte(text))
+		var norm float64
+		for i := 0; i < p.dims; i++ {
+			b := sha256.Sum256(append(seed[:], byte(i), byte(i>>8)))
+			n := binary.BigEndian.Uint32(b[:4])
+			val := (float64(n%2000000)/1000000.0 - 1.0)
+			v[i] = float32(val)
+			norm += val * val
+		}
+		if norm > 0 {
+			scale := float32(1 / math.Sqrt(norm))
+			for i := range v {
+				v[i] *= scale
+			}
+		}
+		out = append(out, v)
+	}
+	return out, nil
+}