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| 1 | +import { URL } from "node:url"; |
| 2 | +import type { ModelDefinitionConfig } from "../config/types.models.js"; |
| 3 | + |
| 4 | +export const ANTHROPIC_AZURE_HOST_SUFFIX = ".services.ai.azure.com"; |
| 5 | +export const ANTHROPIC_AZURE_API_SUFFIX = "/anthropic"; |
| 6 | + |
| 7 | +export const DEFAULT_ANTHROPIC_AZURE_MODEL_ID = "claude-sonnet-4-6"; |
| 8 | + |
| 9 | +export const ANTHROPIC_AZURE_MODEL_CHOICES = [ |
| 10 | + { value: "claude-sonnet-4-6", label: "Claude Sonnet 4.6 (default)" }, |
| 11 | + { value: "claude-opus-4-6", label: "Claude Opus 4.6" }, |
| 12 | +] as const; |
| 13 | + |
| 14 | +const ANTHROPIC_AZURE_DEFAULT_CONTEXT_WINDOW = 200_000; |
| 15 | +const ANTHROPIC_AZURE_DEFAULT_MAX_TOKENS = 16_384; |
| 16 | +const ANTHROPIC_AZURE_DEFAULT_COST = { |
| 17 | + input: 0, |
| 18 | + output: 0, |
| 19 | + cacheRead: 0, |
| 20 | + cacheWrite: 0, |
| 21 | +}; |
| 22 | + |
| 23 | +export function buildAnthropicAzureModelDefinition(params: { |
| 24 | + id: string; |
| 25 | + label?: string; |
| 26 | +}): ModelDefinitionConfig { |
| 27 | + return { |
| 28 | + id: params.id, |
| 29 | + name: params.label ?? params.id, |
| 30 | + reasoning: true, |
| 31 | + input: ["text", "image"], |
| 32 | + cost: ANTHROPIC_AZURE_DEFAULT_COST, |
| 33 | + contextWindow: ANTHROPIC_AZURE_DEFAULT_CONTEXT_WINDOW, |
| 34 | + maxTokens: ANTHROPIC_AZURE_DEFAULT_MAX_TOKENS, |
| 35 | + }; |
| 36 | +} |
| 37 | + |
| 38 | +function ensureHttpsUrl(candidate: string): URL { |
| 39 | + try { |
| 40 | + return new URL(candidate); |
| 41 | + } catch (error) { |
| 42 | + throw new Error(`Invalid Azure Claude URL: ${String(error)}`, { cause: error }); |
| 43 | + } |
| 44 | +} |
| 45 | + |
| 46 | +export function normalizeAnthropicAzureBaseUrl(resourceOrUrl: string): string { |
| 47 | + const raw = String(resourceOrUrl ?? "").trim(); |
| 48 | + if (!raw) { |
| 49 | + throw new Error("Azure Claude resource name or URL is required."); |
| 50 | + } |
| 51 | + if (/^https?:\/\//i.test(raw)) { |
| 52 | + const url = ensureHttpsUrl(raw); |
| 53 | + if (!url.hostname.toLowerCase().endsWith(ANTHROPIC_AZURE_HOST_SUFFIX)) { |
| 54 | + throw new Error( |
| 55 | + `Azure Claude endpoint host must end with "${ANTHROPIC_AZURE_HOST_SUFFIX}". Received ${url.hostname}.`, |
| 56 | + ); |
| 57 | + } |
| 58 | + const normalizedHost = url.hostname.toLowerCase(); |
| 59 | + const basePath = url.pathname.replace(/\/+$/, ""); |
| 60 | + const normalizedPath = basePath.endsWith(ANTHROPIC_AZURE_API_SUFFIX) |
| 61 | + ? basePath |
| 62 | + : `${basePath}${ANTHROPIC_AZURE_API_SUFFIX}`; |
| 63 | + const finalPath = normalizedPath || ANTHROPIC_AZURE_API_SUFFIX; |
| 64 | + return `https://${normalizedHost}${finalPath}`; |
| 65 | + } |
| 66 | + const normalizedResource = raw.toLowerCase(); |
| 67 | + if (/[^a-z0-9-]/.test(normalizedResource)) { |
| 68 | + throw new Error( |
| 69 | + `Azure Claude resource name "${raw}" contains invalid characters. ` + |
| 70 | + "Only lowercase letters, numbers, and hyphens are allowed (e.g. fabric-hub).", |
| 71 | + ); |
| 72 | + } |
| 73 | + if (!normalizedResource) { |
| 74 | + throw new Error("Azure Claude resource name must contain alphanumeric characters or hyphens."); |
| 75 | + } |
| 76 | + return `https://${normalizedResource}${ANTHROPIC_AZURE_HOST_SUFFIX}${ANTHROPIC_AZURE_API_SUFFIX}`; |
| 77 | +} |
| 78 | + |
| 79 | +export function resolveAnthropicAzureResourceName( |
| 80 | + baseUrl: string | null | undefined, |
| 81 | +): string | undefined { |
| 82 | + if (!baseUrl) { |
| 83 | + return undefined; |
| 84 | + } |
| 85 | + try { |
| 86 | + const url = ensureHttpsUrl(baseUrl); |
| 87 | + const host = url.hostname.toLowerCase(); |
| 88 | + if (!host.endsWith(ANTHROPIC_AZURE_HOST_SUFFIX)) { |
| 89 | + return undefined; |
| 90 | + } |
| 91 | + const resource = host.slice(0, -ANTHROPIC_AZURE_HOST_SUFFIX.length); |
| 92 | + return resource || undefined; |
| 93 | + } catch { |
| 94 | + return undefined; |
| 95 | + } |
| 96 | +} |
| 97 | + |
| 98 | +export function resolveAnthropicAzureBaseUrlFromEnv(env: NodeJS.ProcessEnv): string | undefined { |
| 99 | + const baseUrlCandidates = [env.ANTHROPIC_FOUNDRY_BASE_URL, env.AZURE_CLAUDE_BASE_URL]; |
| 100 | + for (const candidate of baseUrlCandidates) { |
| 101 | + if (candidate && candidate.trim()) { |
| 102 | + try { |
| 103 | + return normalizeAnthropicAzureBaseUrl(candidate); |
| 104 | + } catch { |
| 105 | + // fall through to resources if URL invalid |
| 106 | + } |
| 107 | + } |
| 108 | + } |
| 109 | + const resourceCandidates = [env.ANTHROPIC_FOUNDRY_RESOURCE, env.AZURE_CLAUDE_RESOURCE]; |
| 110 | + for (const candidate of resourceCandidates) { |
| 111 | + if (candidate && candidate.trim()) { |
| 112 | + try { |
| 113 | + return normalizeAnthropicAzureBaseUrl(candidate); |
| 114 | + } catch { |
| 115 | + // ignore invalid resources, try next |
| 116 | + } |
| 117 | + } |
| 118 | + } |
| 119 | + return undefined; |
| 120 | +} |
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