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#!/usr/bin/python2.6
# coding: utf-8
import os
import json
from StringIO import StringIO
from whoosh.index import open_dir
from whoosh.qparser import QueryParser
import whoosh.searching as searching
import whoosh.analysis as analysis
import whoosh.highlight as highlight
import whoosh.query as query
import flask
import pyPdf
import werkzeug
import subprocess
app = flask.Flask("booksearch")
index_book = open_dir(u"index", u"book")
index_metadata = open_dir(u"index", u"metadata")
@app.route("/")
def do_index():
return flask.redirect(flask.url_for("do_search",term=""))
@app.route("/book/file/<int:docnum>")
def do_book_file(docnum):
with index_metadata.reader() as reader:
document = reader.stored_fields(docnum)
r = werkzeug.Response(open(document['path'], "r"), mimetype="application/pdf",)
r.headers.add('Content-Disposition', 'attachment',
filename=os.path.basename(document['path']))
return r
def pdf_to_image(filepath, page, size):
if not type(size) == int or size < 1 or size > 2000:
size = 260
density = 60 + 0.15 * size
app.logger.debug("Convert PDF to image page={0} size={1} density={2} filepath={3}".format(page, size, density, filepath))
def generator(process, input):
input.seek(0)
while not process.stdin.closed:
stdout, stderr = process.communicate(input.read())
if stdout:
yield stdout
pdffile = StringIO()
page = pyPdf.PdfFileReader(file(filepath, 'r')).getPage(page)
out = pyPdf.PdfFileWriter()
out.addPage(page)
out.write(pdffile)
process = subprocess.Popen(["/usr/bin/convert", "-density", "{0}".format(density), "-resize", "{0}x".format(size), "pdf:-", "jpeg:-"],
stdin=subprocess.PIPE, stdout=subprocess.PIPE)
return werkzeug.Response(generator(process,pdffile), mimetype="image/jpeg")
@app.route("/page/image/<int:docnum>", methods=["GET"])
@app.route("/page/image/<int:docnum>/<int:size>", methods=["GET"])
def do_page_image(docnum,size=260):
with index_book.reader() as reader:
document = reader.stored_fields(docnum)
page = document['pagenumber'] - 1
return pdf_to_image(document['path'], page, size=size)
@app.route("/book/frontpage/<int:docnum>", methods=["GET"])
def do_book_frontpage(docnum):
with index_metadata.reader() as reader:
document = reader.stored_fields(docnum)
return pdf_to_image(document['path'], 0, 260)
@app.route("/page/file/<int:docnum>", methods=["GET"])
def do_page_file(docnum):
with index_book.reader() as reader:
document = reader.stored_fields(docnum)
filepath = document['path']
page = document['pagenumber'] - 1
app.logger.debug("Extract page={0} from filepath={1}".format(page, filepath) )
inputfile = pyPdf.PdfFileReader(file(filepath, 'r'))
pdfpage = inputfile.getPage(page)
outbuf = StringIO()
outfile = pyPdf.PdfFileWriter()
outfile.addPage(pdfpage)
outfile.write(outbuf)
outbuf.seek(0)
r = werkzeug.Response(outbuf, mimetype="application/pdf")
client_filename = os.path.basename(filepath)[:-3]
client_filename += u".Page-{0}.pdf".format(page)
r.headers.add('Content-Disposition', 'attachment', filename=client_filename)
return r
class MyHtmlFormatter(highlight.HtmlFormatter):
def _format_fragment(self, text, fragment, seen):
text = unicode( flask.Markup.escape(text) )
return highlight.HtmlFormatter._format_fragment(self, text, fragment, seen)
@app.route("/excerpt/<int:docnum>/<path:term>", methods=["GET"])
def excerpt(docnum, term):
def generator(q):
for result in searcher.search(q, limit=1, sortedby="pagenumber"):
terms = [ text for fieldname, text in q.all_terms()
if fieldname == "content" ]
excerpt = highlight.highlight(result.get("content"),
terms,
analysis.StandardAnalyzer(),
highlight.ContextFragmenter(terms, maxchars=400, charsbefore=40, charsafter=40), #highlight.SentenceFragmenter(maxchars=500),
MyHtmlFormatter())
yield json.dumps( { 'pagenumber':result.get("pagenumber"),
'excerpt':excerpt,
'docnum':result.docnum} )
with index_book.reader() as reader:
document = reader.stored_fields(docnum)
q = QueryParser("content").parse(term)
terms = [ text for fieldname, text in q.all_terms()
if fieldname == "content" ]
excerpt = highlight.highlight(document['content'],
terms,
analysis.StandardAnalyzer(),
highlight.SimpleFragmenter(),
MyHtmlFormatter())
return unicode( excerpt )
@app.route("/search/<path:term>",methods=["GET"])
@app.route("/search/", methods=["GET"])
def do_search(term=None):
if not term:
return flask.render_template('search.html', objects=[], term="")
searcher = index_book.searcher()
query = QueryParser("content").parse(term)
facets = searching.Facets.from_field(searcher, "path")
results = searcher.search(query, limit=None, sortedby="pagenumber")
categories = facets.categorize(results)
searcher.close()
books = {}
with index_book.reader() as reader:
for book in categories.items():
filepath = book[0]
with index_metadata.searcher() as searcher:
docnum = searcher.document_number(path=filepath)
with index_metadata.reader() as reader2:
title = reader2.stored_fields(docnum).get('title')
books[docnum] = {
'matches' : [],
'title':title,
'filename' : os.path.basename(filepath),
}
for match in book[1]:
pagenumber = reader.stored_fields(match[0])['pagenumber']
match = (match[0], match[1], pagenumber)
books[docnum]['matches'].append(match)
return flask.render_template('search.html',
books=books,
term=term)
def log_response(sender, response):
sender.logger.debug('Request context is about to close down. '
'Response: %s', response)
if __name__ == "__main__":
app.debug = True
app.run(host="0.0.0.0")
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