Push Vault files to index to Khoj server using Khoj Obsidian plugin

Use the multi-part/form-data request to sync Markdown, PDF files in
vault to index on khoj server

Run scheduled job to push updates to value for indexing every 1 hour

src/interface/obsidian/src/main.ts

@@ -1,12 +1,13 @@
-import { Notice, Plugin } from 'obsidian';
+import { Notice, Plugin, TFile } from 'obsidian';
 import { KhojSetting, KhojSettingTab, DEFAULT_SETTINGS } from 'src/settings'
 import { KhojSearchModal } from 'src/search_modal'
 import { KhojChatModal } from 'src/chat_modal'
-import { configureKhojBackend } from './utils';
+import { configureKhojBackend, updateContentIndex } from './utils';
 
 
 export default class Khoj extends Plugin {
     settings: KhojSetting;
+    indexingTimer: NodeJS.Timeout;
 
     async onload() {
         await this.loadSettings();
@@ -54,6 +55,13 @@ export default class Khoj extends Plugin {
 
         // Add a settings tab so the user can configure khoj
         this.addSettingTab(new KhojSettingTab(this.app, this));
+
+        // Add scheduled job to update index every 60 minutes
+        this.indexingTimer = setInterval(async () => {
+            if (this.settings.autoConfigure) {
+                this.lastSyncedFiles = await updateContentIndex(this.app.vault, this.settings);
+            }
+        }, 60 * 60 * 1000);
     }
 
     async loadSettings() {
@@ -72,4 +80,12 @@ export default class Khoj extends Plugin {
         }
         this.saveData(this.settings);
     }
+
+    async onunload() {
+        // Remove scheduled job to update index at regular cadence
+        if (this.indexingTimer)
+            clearInterval(this.indexingTimer);
+
+        this.unload();
+    }
 }

src/interface/obsidian/src/utils.ts

@@ -1,4 +1,4 @@
-import { FileSystemAdapter, Notice, RequestUrlParam, request, Vault, Modal } from 'obsidian';
+import { FileSystemAdapter, Notice, RequestUrlParam, request, Vault, Modal, TFile } from 'obsidian';
 import { KhojSetting } from 'src/settings'
 
 export function getVaultAbsolutePath(vault: Vault): string {
@@ -22,6 +22,58 @@ interface ProcessorData {
     };
 }
 
+function fileExtensionToMimeType (extension: string): string {
+    switch (extension) {
+        case 'pdf':
+            return 'application/pdf';
+        case 'png':
+            return 'image/png';
+        case 'jpg':
+        case 'jpeg':
+            return 'image/jpeg';
+        case 'md':
+        case 'markdown':
+            return 'text/markdown';
+        case 'org':
+            return 'text/org';
+        default:
+            return 'text/plain';
+    }
+}
+
+export async function updateContentIndex(vault: Vault, setting: KhojSetting): Promise<TFile[]> {
+    // Get all markdown, pdf files in the vault
+    console.log(`Khoj: Updating Khoj content index...`)
+    const files = vault.getFiles().filter(file => file.extension === 'md' || file.extension === 'pdf');
+    const binaryFileTypes = ['pdf', 'png', 'jpg', 'jpeg']
+
+    // Create multipart form data with all markdown, pdf files
+    const formData = new FormData();
+    for (const file of files) {
+        const encoding = binaryFileTypes.includes(file.extension) ? "binary" : "utf8";
+        const mimeType = fileExtensionToMimeType(file.extension) + (encoding === "utf8" ? "; charset=UTF-8" : "");
+        const fileContent = await vault.read(file);
+        formData.append('files', new Blob([fileContent], { type: mimeType }), file.path);
+    }
+
+    // Call Khoj backend to update index with all markdown, pdf files
+    const response = await fetch(`${setting.khojUrl}/api/v1/indexer/batch`, {
+        method: 'POST',
+        headers: {
+            'x-api-key': 'secret',
+        },
+        body: formData,
+    });
+
+    if (!response.ok) {
+        new Notice(`❗️Failed to update Khoj content index. Ensure Khoj server connected or raise issue on Khoj Discord/Github\nError: ${response.statusText}`);
+    } else {
+        console.log(`✅ Refreshed Khoj content index.`);
+    }
+
+    return files;
+}
+
 export async function configureKhojBackend(vault: Vault, setting: KhojSetting, notify: boolean = true) {
     let vaultPath = getVaultAbsolutePath(vault);
     let mdInVault = `${vaultPath}/**/*.md`;