68 lines
2.4 KiB
Python
68 lines
2.4 KiB
Python
# Helper to manage pdf related requests
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# by Humans for All
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import urllib.parse
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import urlvalidator as uv
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from typing import TYPE_CHECKING
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if TYPE_CHECKING:
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from simpleproxy import ProxyHandler
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def process_pdf2text(url: str, startPN: int, endPN: int):
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"""
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Extract textual content from given pdf.
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* Validate the got url.
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* Extract textual contents of the pdf from given start page number to end page number (inclusive).
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* if -1 | 0 is specified wrt startPN, the actual starting page number (rather 1) will be used.
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* if -1 | 0 is specified wrt endPN, the actual ending page number will be used.
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NOTE: Page numbers start from 1, while the underlying list data structure index starts from 0
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"""
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import pypdf
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import io
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gotVU = uv.validate_url(url, "HandlePdf2Text")
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if not gotVU.callOk:
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return { 'status': gotVU.statusCode, 'msg': gotVU.statusMsg }
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urlParts = urllib.parse.urlparse(url)
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fPdf = open(urlParts.path, 'rb')
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dPdf = fPdf.read()
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tPdf = ""
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oPdf = pypdf.PdfReader(io.BytesIO(dPdf))
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if (startPN <= 0):
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startPN = 1
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if (endPN <= 0) or (endPN > len(oPdf.pages)):
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endPN = len(oPdf.pages)
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for i in range(startPN, endPN+1):
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pd = oPdf.pages[i-1]
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tPdf = tPdf + pd.extract_text()
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return { 'status': 200, 'msg': "Pdf2Text Response follows", 'data': tPdf }
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def handle_pdf2text(ph: 'ProxyHandler', pr: urllib.parse.ParseResult):
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"""
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Handle requests to pdf2text path, which is used to extract plain text
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from the specified pdf file.
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"""
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queryParams = urllib.parse.parse_qs(pr.query)
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url = queryParams['url'][0]
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startP = queryParams.get('startPageNumber', -1)
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if isinstance(startP, list):
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startP = int(startP[0])
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endP = queryParams.get('endPageNumber', -1)
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if isinstance(endP, list):
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endP = int(endP[0])
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print(f"INFO:HandlePdf2Text:Processing:{url}:{startP}:{endP}...")
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gotP2T = process_pdf2text(url, startP, endP)
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if (gotP2T['status'] != 200):
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ph.send_error(gotP2T['status'], gotP2T['msg'] )
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return
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ph.send_response(gotP2T['status'], gotP2T['msg'])
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ph.send_header('Content-Type', 'text/text')
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# Add CORS for browser fetch, just in case
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ph.send_header('Access-Control-Allow-Origin', '*')
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ph.end_headers()
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print(f"INFO:HandlePdf2Text:ExtractedText:{url}...")
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ph.wfile.write(gotP2T['data'].encode('utf-8'))
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