refactor: repartition server-side and client-side code

app/.server/modules/llm/providers/perplexity.ts

@@ -0,0 +1,48 @@
+import { createOpenAI } from '@ai-sdk/openai';
+import type { LanguageModel } from 'ai';
+import { BaseProvider } from '~/.server/modules/llm/base-provider';
+import type { ModelInfo } from '~/.server/modules/llm/types';
+import type { IProviderSetting } from '~/types/model';
+
+export default class PerplexityProvider extends BaseProvider {
+  name = 'Perplexity';
+  getApiKeyLink = 'https://www.perplexity.ai/settings/api';
+
+  staticModels: ModelInfo[] = [
+    {
+      name: 'llama-3.1-sonar-small-128k-online',
+      label: 'Sonar Small Online',
+      provider: 'Perplexity',
+      maxTokenAllowed: 8192,
+    },
+    {
+      name: 'llama-3.1-sonar-large-128k-online',
+      label: 'Sonar Large Online',
+      provider: 'Perplexity',
+      maxTokenAllowed: 8192,
+    },
+    {
+      name: 'llama-3.1-sonar-huge-128k-online',
+      label: 'Sonar Huge Online',
+      provider: 'Perplexity',
+      maxTokenAllowed: 8192,
+    },
+  ];
+
+  getModelInstance(options: { model: string; providerSettings?: Record<string, IProviderSetting> }): LanguageModel {
+    const { model, providerSettings } = options;
+
+    const { apiKey } = this.getProviderBaseUrlAndKey(providerSettings?.[this.name]);
+
+    if (!apiKey) {
+      throw new Error(`Missing API key for ${this.name} provider`);
+    }
+
+    const perplexity = createOpenAI({
+      baseURL: 'https://api.perplexity.ai/',
+      apiKey,
+    });
+
+    return perplexity(model);
+  }
+}