| 1 | // fetch.go — model auto-discovery via the OpenAI-compatible GET /models API. |
| 2 | package config |
| 3 | |
| 4 | import ( |
| 5 | "context" |
| 6 | "fmt" |
| 7 | "strings" |
| 8 | |
| 9 | "reasonix/internal/provider/openai" |
| 10 | ) |
| 11 | |
| 12 | var knownModelFetchCompatSuffixes = []string{ |
| 13 | "/api/claudecode", |
| 14 | "/api/anthropic", |
| 15 | "/apps/anthropic", |
| 16 | "/api/coding", |
| 17 | "/claudecode", |
| 18 | "/anthropic", |
| 19 | "/step_plan", |
| 20 | "/coding", |
| 21 | "/claude", |
| 22 | } |
| 23 | |
| 24 | // FetchModels queries the provider's OpenAI-compatible GET /models endpoint and |
| 25 | // returns the available model IDs, sorted alphabetically. |
| 26 | func (e *ProviderEntry) FetchModels(ctx context.Context) ([]string, error) { |
| 27 | if e.BaseURL == "" { |
| 28 | return nil, fmt.Errorf("fetch models: provider %q has no base_url", e.Name) |
| 29 | } |
| 30 | key := e.APIKey() |
| 31 | if e.RequiresAPIKey() && key == "" { |
| 32 | return nil, fmt.Errorf("fetch models: provider %q has no API key (set %s in .env)", e.Name, e.APIKeyEnv) |
| 33 | } |
| 34 | candidates, err := BuildModelFetchURLs(e.BaseURL, e.ModelsURL) |
| 35 | if err != nil { |
| 36 | return nil, err |
| 37 | } |
| 38 | var lastErr error |
| 39 | var firstHardErr error |
| 40 | authMode := modelFetchAuthMode(e) |
| 41 | for _, u := range candidates { |
| 42 | models, err := openai.FetchModelsWithOptions(ctx, u, key, openai.FetchModelsOptions{ |
| 43 | Headers: e.Headers, |
| 44 | AuthMode: authMode, |
| 45 | }) |
| 46 | if err == nil { |
| 47 | return models, nil |
| 48 | } |
| 49 | lastErr = err |
| 50 | if !openai.IsModelFetchEndpointMiss(err) && firstHardErr == nil { |
| 51 | firstHardErr = err |
| 52 | } |
| 53 | } |
| 54 | if firstHardErr != nil { |
| 55 | return nil, firstHardErr |
| 56 | } |
| 57 | return nil, lastErr |
| 58 | } |
| 59 | |
| 60 | func modelFetchAuthMode(e *ProviderEntry) openai.ModelFetchAuthMode { |
| 61 | if e == nil || !strings.EqualFold(strings.TrimSpace(e.Kind), "anthropic") { |
| 62 | return openai.ModelFetchAuthAuto |
| 63 | } |
| 64 | if e.AuthHeader { |
| 65 | return openai.ModelFetchAuthBearer |
| 66 | } |
| 67 | return openai.ModelFetchAuthXAPIKey |
| 68 | } |
| 69 | |
| 70 | // BuildModelFetchURLs derives likely OpenAI-compatible model-list endpoints. |
| 71 | // It keeps Reasonix's historical {base}/models path first, then tries the common |
| 72 | // {base}/v1/models shape used by many aggregators. |
| 73 | func BuildModelFetchURLs(baseURL, override string) ([]string, error) { |
| 74 | if trimmed := strings.TrimSpace(override); trimmed != "" { |
| 75 | return []string{trimmed}, nil |
| 76 | } |
| 77 | base := strings.TrimRight(strings.TrimSpace(baseURL), "/") |
| 78 | if base == "" { |
| 79 | return nil, fmt.Errorf("fetch models: base_url is required") |
| 80 | } |
| 81 | var candidates []string |
| 82 | if endsWithVersionSegment(base) { |
| 83 | candidates = append(candidates, base+"/models") |
| 84 | if !strings.HasSuffix(base, "/v1") { |
| 85 | candidates = append(candidates, base+"/v1/models") |
| 86 | } |
| 87 | } else { |
| 88 | candidates = append(candidates, base+"/models", base+"/v1/models") |
| 89 | } |
| 90 | if stripped := stripModelFetchCompatSuffix(base); stripped != "" { |
| 91 | root := strings.TrimRight(stripped, "/") |
| 92 | candidates = append(candidates, root+"/models", root+"/v1/models") |
| 93 | } |
| 94 | return uniqueStrings(candidates), nil |
| 95 | } |
| 96 | |
| 97 | func endsWithVersionSegment(raw string) bool { |
| 98 | last := raw |
| 99 | if i := strings.LastIndex(raw, "/"); i >= 0 { |
| 100 | last = raw[i+1:] |
| 101 | } |
| 102 | if len(last) < 2 || last[0] != 'v' { |
| 103 | return false |
| 104 | } |
| 105 | for _, r := range last[1:] { |
| 106 | if r < '0' || r > '9' { |
| 107 | return false |
| 108 | } |
| 109 | } |
| 110 | return true |
| 111 | } |
| 112 | |
| 113 | func stripModelFetchCompatSuffix(base string) string { |
| 114 | for _, suffix := range knownModelFetchCompatSuffixes { |
| 115 | if strings.HasSuffix(base, suffix) { |
| 116 | return base[:len(base)-len(suffix)] |
| 117 | } |
| 118 | } |
| 119 | return "" |
| 120 | } |
| 121 | |
| 122 | func uniqueStrings(in []string) []string { |
| 123 | out := make([]string, 0, len(in)) |
| 124 | for _, s := range in { |
| 125 | if s == "" { |
| 126 | continue |
| 127 | } |
| 128 | seen := false |
| 129 | for _, existing := range out { |
| 130 | if existing == s { |
| 131 | seen = true |
| 132 | break |
| 133 | } |
| 134 | } |
| 135 | if !seen { |
| 136 | out = append(out, s) |
| 137 | } |
| 138 | } |
| 139 | return out |
| 140 | } |
| 141 |