feat: API for content

app/Http/Controllers/Api/TerminalApiController.php

@@ -3,9 +3,11 @@
 namespace App\Http\Controllers\Api;
 
 use App\Http\Controllers\Controller;
+use App\Models\Document;
 use App\Models\Guide;
 use App\Models\GuidePage;
 use App\Models\GuidePageEdge;
+use App\Models\KnowledgeBase;
 use App\Services\KnowledgeContextService;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
@@ -168,6 +170,66 @@ class TerminalApiController extends Controller
         });
     }
 
+    /**
+     * GET /api/terminal/documents/{document}/content
+     * 读取文档全文或指定行号区间
+     */
+    public function documentContent(Request $request, int $documentId): JsonResponse
+    {
+        $request->validate([
+            'start_line' => 'sometimes|integer|min:1',
+            'end_line' => 'sometimes|integer|min:1',
+        ]);
+
+        $terminal = $request->attributes->get('terminal');
+
+        // Find document and verify access through station → knowledge_base
+        $accessibleKbIds = KnowledgeBase::where(function ($q) use ($terminal) {
+            $q->whereDoesntHave('stations'); // global knowledge bases
+            if ($terminal->station_id) {
+                $q->orWhereHas('stations', fn ($sq) => $sq->where('stations.id', $terminal->station_id));
+            }
+        })->where('status', 'active')->pluck('id');
+
+        $document = Document::where('id', $documentId)
+            ->whereIn('knowledge_base_id', $accessibleKbIds)
+            ->where('conversion_status', 'completed')
+            ->first();
+
+        if (!$document) {
+            return response()->json(['error' => 'Document not found'], 404);
+        }
+
+        $content = $document->getMarkdownContent();
+        if ($content === null) {
+            return response()->json(['error' => 'Document content unavailable'], 404);
+        }
+
+        $lines = explode("\n", $content);
+        $totalLines = count($lines);
+
+        $startLine = $request->integer('start_line', 1);
+        $endLine = $request->integer('end_line', min($startLine + 49, $totalLines));
+        $endLine = min($endLine, $totalLines);
+
+        if ($startLine > $totalLines) {
+            return response()->json([
+                'error' => "start_line ({$startLine}) exceeds total lines ({$totalLines})",
+            ], 422);
+        }
+
+        $slice = array_slice($lines, $startLine - 1, $endLine - $startLine + 1);
+
+        return response()->json([
+            'id' => $document->id,
+            'title' => $document->title,
+            'total_lines' => $totalLines,
+            'start_line' => $startLine,
+            'end_line' => $endLine,
+            'content' => implode("\n", $slice),
+        ]);
+    }
+
     /**
      * POST /api/terminal/heartbeat
      * 终端心跳上报

app/Services/KnowledgeContextService.php

@@ -37,9 +37,12 @@ class KnowledgeContextService
             }
 
             $context .= $snippet . "\n\n";
+
+            $fullContent = $document->getMarkdownContent() ?? '';
             $sources[] = [
                 'title' => $document->title,
-                'id' => 'kb-doc-' . str_pad($document->id, 3, '0', STR_PAD_LEFT),
+                'id' => $document->id,
+                'total_lines' => $fullContent !== '' ? substr_count($fullContent, "\n") + 1 : 0,
             ];
         }
 
@@ -52,11 +55,12 @@ class KnowledgeContextService
     private function extractSnippet($document): string
     {
         $content = $document->getMarkdownContent() ?? $document->description ?? '';
+        $header = "【{$document->title}】(ID:{$document->id})";
 
         if (mb_strlen($content) <= 500) {
-            return "【{$document->title}】\n{$content}";
+            return "{$header}\n{$content}";
         }
 
-        return "【{$document->title}】\n" . mb_substr($content, 0, 500) . '...';
+        return "{$header}\n" . mb_substr($content, 0, 500) . '...';
     }
 }

routes/api.php

@@ -4,12 +4,15 @@ use App\Http\Controllers\Api\TerminalApiController;
 use Illuminate\Support\Facades\Route;
 
 Route::middleware('identify.terminal')->group(function () {
-    Route::get('/knowledge', [TerminalApiController::class, 'knowledge']);
-
     Route::prefix('terminal')->group(function () {
+        Route::post('/heartbeat', [TerminalApiController::class, 'heartbeat']);
+
         Route::get('/config', [TerminalApiController::class, 'config']);
+
         Route::get('/guides', [TerminalApiController::class, 'guides']);
         Route::post('/guides/pages', [TerminalApiController::class, 'guidePages']);
-        Route::post('/heartbeat', [TerminalApiController::class, 'heartbeat']);
+
+        Route::get('/knowledge', [TerminalApiController::class, 'knowledge']);
+        Route::get('/documents/{document}/content', [TerminalApiController::class, 'documentContent']);
     });
 });