chore: import upstream snapshot with attribution

apps/sim/lib/file-parsers/pptx-parser.ts

@@ -0,0 +1,109 @@
+import { existsSync } from 'fs'
+import { readFile } from 'fs/promises'
+import { createLogger } from '@sim/logger'
+import type { FileParseResult, FileParser } from '@/lib/file-parsers/types'
+import { sanitizeTextForUTF8 } from '@/lib/file-parsers/utils'
+import { assertOoxmlArchiveWithinLimits } from '@/lib/file-parsers/zip-guard'
+
+const logger = createLogger('PptxParser')
+
+export class PptxParser implements FileParser {
+  async parseFile(filePath: string): Promise<FileParseResult> {
+    try {
+      if (!filePath) {
+        throw new Error('No file path provided')
+      }
+
+      if (!existsSync(filePath)) {
+        throw new Error(`File not found: ${filePath}`)
+      }
+
+      logger.info(`Parsing PowerPoint file: ${filePath}`)
+
+      const buffer = await readFile(filePath)
+      return this.parseBuffer(buffer)
+    } catch (error) {
+      logger.error('PowerPoint file parsing error:', error)
+      throw new Error(`Failed to parse PowerPoint file: ${(error as Error).message}`)
+    }
+  }
+
+  async parseBuffer(buffer: Buffer): Promise<FileParseResult> {
+    try {
+      logger.info('Parsing PowerPoint buffer, size:', buffer.length)
+
+      if (!buffer || buffer.length === 0) {
+        throw new Error('Empty buffer provided')
+      }
+
+      assertOoxmlArchiveWithinLimits(buffer)
+
+      let parseOfficeAsync
+      try {
+        const officeParser = await import('officeparser')
+        parseOfficeAsync = officeParser.parseOfficeAsync
+      } catch (importError) {
+        logger.warn('officeparser not available, using fallback extraction')
+        return this.fallbackExtraction(buffer)
+      }
+
+      try {
+        const result = await parseOfficeAsync(buffer)
+
+        if (!result || typeof result !== 'string') {
+          throw new Error('officeparser returned invalid result')
+        }
+
+        const content = sanitizeTextForUTF8(result.trim())
+
+        logger.info('PowerPoint parsing completed successfully with officeparser')
+
+        return {
+          content: content,
+          metadata: {
+            characterCount: content.length,
+            extractionMethod: 'officeparser',
+          },
+        }
+      } catch (extractError) {
+        logger.warn('officeparser failed, using fallback:', extractError)
+        return this.fallbackExtraction(buffer)
+      }
+    } catch (error) {
+      logger.error('PowerPoint buffer parsing error:', error)
+      throw new Error(`Failed to parse PowerPoint buffer: ${(error as Error).message}`)
+    }
+  }
+
+  private fallbackExtraction(buffer: Buffer): FileParseResult {
+    logger.info('Using fallback text extraction for PowerPoint file')
+
+    const text = buffer.toString('utf8', 0, Math.min(buffer.length, 200000))
+
+    const readableText = text
+      .match(/[\x20-\x7E\s]{4,}/g)
+      ?.filter(
+        (chunk) =>
+          chunk.trim().length > 10 &&
+          /[a-zA-Z]/.test(chunk) &&
+          !/^[\x00-\x1F]*$/.test(chunk) &&
+          !/^[^\w\s]*$/.test(chunk)
+      )
+      .join(' ')
+      .replace(/\s+/g, ' ')
+      .trim()
+
+    const content = readableText
+      ? sanitizeTextForUTF8(readableText)
+      : 'Unable to extract text from PowerPoint file. Please ensure the file contains readable text content.'
+
+    return {
+      content,
+      metadata: {
+        extractionMethod: 'fallback',
+        characterCount: content.length,
+        warning: 'Basic text extraction used',
+      },
+    }
+  }
+}