| 1 | // fetch.go — model auto-discovery via the OpenAI-compatible GET /models API. |
| 2 | package config |
| 3 | |
| 4 | import ( |
| 5 | "context" |
| 6 | "fmt" |
| 7 | "slices" |
| 8 | "strings" |
| 9 | |
| 10 | "reasonix/internal/netclient" |
| 11 | "reasonix/internal/provider" |
| 12 | "reasonix/internal/provider/openai" |
| 13 | ) |
| 14 | |
| 15 | var knownModelFetchCompatSuffixes = []string{ |
| 16 | "/api/claudecode", |
| 17 | "/api/anthropic", |
| 18 | "/apps/anthropic", |
| 19 | "/api/coding", |
| 20 | "/claudecode", |
| 21 | "/anthropic", |
| 22 | "/step_plan", |
| 23 | "/coding", |
| 24 | "/claude", |
| 25 | } |
| 26 | |
| 27 | // FetchModels queries the provider's OpenAI-compatible GET /models endpoint and |
| 28 | // returns the available model IDs, sorted alphabetically. |
| 29 | func (e *ProviderEntry) FetchModels(ctx context.Context) ([]string, error) { |
| 30 | return e.FetchModelsWithProxy(ctx, netclient.ProxySpec{}) |
| 31 | } |
| 32 | |
| 33 | // FetchModelCatalog discovers model IDs together with adapter-owned input |
| 34 | // modality metadata. FetchModelsWithProxy remains the compatibility wrapper |
| 35 | // used by older callers. |
| 36 | func (e *ProviderEntry) FetchModelCatalog(ctx context.Context) ([]provider.ModelInfo, error) { |
| 37 | return e.FetchModelCatalogWithProxy(ctx, netclient.ProxySpec{}) |
| 38 | } |
| 39 | |
| 40 | // FetchModelsWithProxy is FetchModels routed through the same network policy as |
| 41 | // chat requests. Passing cfg.NetworkProxySpec() makes model discovery fail at |
| 42 | // setup time when the proxy path is broken, instead of succeeding here and |
| 43 | // stalling the first chat turn later (#9560). |
| 44 | func (e *ProviderEntry) FetchModelsWithProxy(ctx context.Context, proxy netclient.ProxySpec) ([]string, error) { |
| 45 | catalog, err := e.FetchModelCatalogWithProxy(ctx, proxy) |
| 46 | if err != nil { |
| 47 | return nil, err |
| 48 | } |
| 49 | models := make([]string, 0, len(catalog)) |
| 50 | for _, model := range catalog { |
| 51 | models = append(models, model.ID) |
| 52 | } |
| 53 | return models, nil |
| 54 | } |
| 55 | |
| 56 | // FetchModelCatalogWithProxy is FetchModelsWithProxy with model capability |
| 57 | // metadata preserved through the config/provider boundary. |
| 58 | func (e *ProviderEntry) FetchModelCatalogWithProxy(ctx context.Context, proxy netclient.ProxySpec) ([]provider.ModelInfo, error) { |
| 59 | if e.BaseURL == "" { |
| 60 | return nil, fmt.Errorf("fetch models: provider %q has no base_url", e.Name) |
| 61 | } |
| 62 | key := e.APIKey() |
| 63 | if e.RequiresAPIKey() && key == "" { |
| 64 | return nil, fmt.Errorf("fetch models: provider %q has no API key (set %s in .env)", e.Name, e.APIKeyEnv) |
| 65 | } |
| 66 | candidates, err := BuildModelFetchURLs(e.BaseURL, e.ModelsURL) |
| 67 | if err != nil { |
| 68 | return nil, err |
| 69 | } |
| 70 | var lastErr error |
| 71 | var firstHardErr error |
| 72 | authMode := modelFetchAuthMode(e) |
| 73 | for _, u := range candidates { |
| 74 | models, err := openai.FetchModelCatalogWithOptions(ctx, u, key, openai.FetchModelsOptions{ |
| 75 | Headers: e.Headers, |
| 76 | AuthMode: authMode, |
| 77 | Proxy: proxy, |
| 78 | }) |
| 79 | if err == nil { |
| 80 | allowed := provider.FilterOpenCodeGoRequestModels(e.Kind, e.BaseURL, e.RequestURL, e.ChatURL, modelInfoIDs(models)) |
| 81 | keep := make(map[string]bool, len(allowed)) |
| 82 | for _, id := range allowed { |
| 83 | keep[id] = true |
| 84 | } |
| 85 | filtered := make([]provider.ModelInfo, 0, len(models)) |
| 86 | for _, model := range models { |
| 87 | if keep[model.ID] { |
| 88 | filtered = append(filtered, model) |
| 89 | } |
| 90 | } |
| 91 | return filtered, nil |
| 92 | } |
| 93 | lastErr = err |
| 94 | if !openai.IsModelFetchEndpointMiss(err) && firstHardErr == nil { |
| 95 | firstHardErr = err |
| 96 | } |
| 97 | } |
| 98 | if firstHardErr != nil { |
| 99 | return nil, firstHardErr |
| 100 | } |
| 101 | return nil, lastErr |
| 102 | } |
| 103 | |
| 104 | func modelInfoIDs(models []provider.ModelInfo) []string { |
| 105 | ids := make([]string, 0, len(models)) |
| 106 | for _, model := range models { |
| 107 | ids = append(ids, model.ID) |
| 108 | } |
| 109 | return ids |
| 110 | } |
| 111 | |
| 112 | func modelFetchAuthMode(e *ProviderEntry) openai.ModelFetchAuthMode { |
| 113 | if e == nil || !strings.EqualFold(strings.TrimSpace(e.Kind), "anthropic") { |
| 114 | return openai.ModelFetchAuthAuto |
| 115 | } |
| 116 | if e.AuthHeader { |
| 117 | return openai.ModelFetchAuthBearer |
| 118 | } |
| 119 | return openai.ModelFetchAuthXAPIKey |
| 120 | } |
| 121 | |
| 122 | // BuildModelFetchURLs derives likely OpenAI-compatible model-list endpoints. |
| 123 | // It keeps Reasonix's historical {base}/models path first, then tries the common |
| 124 | // {base}/v1/models shape used by many aggregators. Known official Token Rhythm |
| 125 | // URLs collapse to a single /v1/models candidate because that /v1 route is complete. |
| 126 | func BuildModelFetchURLs(baseURL, override string) ([]string, error) { |
| 127 | if trimmed := strings.TrimSpace(override); trimmed != "" { |
| 128 | if canonical, ok := canonicalVendorModelsURL(trimmed); ok { |
| 129 | return []string{canonical}, nil |
| 130 | } |
| 131 | return []string{trimmed}, nil |
| 132 | } |
| 133 | if canonical, ok := canonicalVendorModelsURL(baseURL); ok { |
| 134 | return []string{canonical}, nil |
| 135 | } |
| 136 | base := strings.TrimRight(strings.TrimSpace(baseURL), "/") |
| 137 | if base == "" { |
| 138 | return nil, fmt.Errorf("fetch models: base_url is required") |
| 139 | } |
| 140 | var candidates []string |
| 141 | if endsWithVersionSegment(base) { |
| 142 | candidates = append(candidates, base+"/models") |
| 143 | if !strings.HasSuffix(base, "/v1") { |
| 144 | candidates = append(candidates, base+"/v1/models") |
| 145 | } |
| 146 | } else { |
| 147 | candidates = append(candidates, base+"/models", base+"/v1/models") |
| 148 | } |
| 149 | if stripped := stripModelFetchCompatSuffix(base); stripped != "" { |
| 150 | root := strings.TrimRight(stripped, "/") |
| 151 | candidates = append(candidates, root+"/models", root+"/v1/models") |
| 152 | } |
| 153 | return uniqueStrings(candidates), nil |
| 154 | } |
| 155 | |
| 156 | // canonicalVendorModelsURL rewrites official vendor bases whose documented |
| 157 | // form differs from the OpenAI-compatible shape (Token Rhythm, StepFun step_plan). |
| 158 | func canonicalVendorModelsURL(raw string) (string, bool) { |
| 159 | if canonical, ok := openai.CanonicalTokenRhythmModelsURL(raw); ok { |
| 160 | return canonical, true |
| 161 | } |
| 162 | return openai.CanonicalStepFunPlanModelsURL(raw) |
| 163 | } |
| 164 | |
| 165 | func endsWithVersionSegment(raw string) bool { |
| 166 | last := raw |
| 167 | if i := strings.LastIndex(raw, "/"); i >= 0 { |
| 168 | last = raw[i+1:] |
| 169 | } |
| 170 | if len(last) < 2 || last[0] != 'v' { |
| 171 | return false |
| 172 | } |
| 173 | for _, r := range last[1:] { |
| 174 | if r < '0' || r > '9' { |
| 175 | return false |
| 176 | } |
| 177 | } |
| 178 | return true |
| 179 | } |
| 180 | |
| 181 | func stripModelFetchCompatSuffix(base string) string { |
| 182 | for _, suffix := range knownModelFetchCompatSuffixes { |
| 183 | if strings.HasSuffix(base, suffix) { |
| 184 | return base[:len(base)-len(suffix)] |
| 185 | } |
| 186 | } |
| 187 | return "" |
| 188 | } |
| 189 | |
| 190 | func uniqueStrings(in []string) []string { |
| 191 | out := make([]string, 0, len(in)) |
| 192 | for _, s := range in { |
| 193 | if s == "" { |
| 194 | continue |
| 195 | } |
| 196 | seen := slices.Contains(out, s) |
| 197 | if !seen { |
| 198 | out = append(out, s) |
| 199 | } |
| 200 | } |
| 201 | return out |
| 202 | } |
| 203 |