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February 18, 2017 06:40
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test if a file is a pdf by only downloading the first 4 bytes. It may be better to use http headers, but if you think those may be wrong...
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| import requests | |
| def test_for_pdf(url): | |
| r = requests.get(url, stream=True) | |
| return ( next(r.iter_content(chunk_size=4)) == '%PDF' ) | |
| # See pdf file spec, p. 92: http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/pdf_reference_1-7.pdf | |
| if __name__ == '__main__': | |
| # a pdf: | |
| url = 'https://fremont.gov/DocumentCenter/View/31856' | |
| print(url + " is pdf? " + str(test_for_pdf(url)) ) | |
| # another pdf | |
| url = 'https://fremont.gov/DocumentCenter/Home/View/584' | |
| print(url + " is pdf? " + str(test_for_pdf(url)) ) | |
| # not a pdf | |
| url = 'https://fremont.gov/27/Departments' | |
| print(url + " is pdf? " + str(test_for_pdf(url)) ) |
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