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import io
import os
import re
import time
import numpy as np
import logging
import urllib.request
from flask import Blueprint, request, jsonify
from PIL import Image
from app.models.sql_factory import search_by_phash, add_phash
from app.utils.im_utils import compute_phash_int
from app.utils.file_utils import sha256_stream
sanitize_re = re.compile('[\W]+')
valid_exts = ['.gif', '.jpg', '.jpeg', '.png']
MATCH_THRESHOLD = 6
MATCH_LIMIT = 1
SIMILAR_THRESHOLD = 20
SIMILAR_LIMIT = 10
api = Blueprint('api', __name__)
@api.route('/')
def index():
"""
API status test endpoint
"""
return jsonify({ 'status': 'ok' })
def get_params(default_threshold=MATCH_THRESHOLD, default_limit=MATCH_LIMIT):
try:
threshold = int(request.form.get('threshold') or default_threshold)
limit = int(request.form.get('limit') or default_limit)
except:
return None, 'param_error'
# Process uploaded file
if 'q' in request.files:
file = request.files['q']
fn = file.filename
# demo client currently uploads a jpeg called 'blob'
if fn.endswith('blob'):
logging.debug('received a blob, assuming JPEG')
fn = 'filename.jpg'
basename, ext = os.path.splitext(fn)
if ext.lower() not in valid_exts:
return None, 'not_an_image'
ext = ext[1:].lower()
raw = None
im = Image.open(file.stream).convert('RGB')
url = None
# Fetch remote URL
else:
url = request.form.get('url')
if not url:
return None, 'no_image'
basename, ext = os.path.splitext(url)
if ext.lower() not in valid_exts:
return None, 'not_an_image'
ext = ext[1:].lower()
remote_request = urllib.request.Request(url)
remote_response = urllib.request.urlopen(remote_request)
raw = remote_response.read()
im = Image.open(io.BytesIO(raw)).convert('RGB')
return (threshold, limit, url, ext, raw, im,), None
@api.route('/v1/match', methods=['POST'])
def match():
"""
Search by uploading an image
"""
params, error = get_params()
if error:
return jsonify({
'success': False,
'match': False,
'error': error,
})
threshold, limit, url, ext, raw, im = params
start = time.time()
phash = compute_phash_int(im)
results = search_by_phash(phash=phash, threshold=threshold, limit=limit)
if len(results) == 0:
if url:
# hash = sha256_stream(file)
hash = sha256_stream(io.BytesIO(raw))
add_phash(sha256=hash, phash=phash, ext=ext, url=url)
match = False
else:
match = True
logging.debug('query took {0:.2g} s.'.format(time.time() - start))
return jsonify({
'success': True,
'match': match,
'results': results,
'timing': time.time() - start,
})
@api.route('/v1/similar', methods=['POST'])
def similar():
"""
Search by uploading an image
"""
params, error = get_params(default_threshold=SIMILAR_THRESHOLD, default_limit=SIMILAR_LIMIT)
if error:
return jsonify({
'success': False,
'match': False,
'error': error,
})
threshold, limit, url, ext, raw, im = params
start = time.time()
phash = compute_phash_int(im)
ext = ext[1:].lower()
results = search_by_phash(phash=phash, threshold=threshold, limit=limit)
if len(results) == 0:
match = False
else:
match = True
logging.debug('query took {0:.2g} s.'.format(time.time() - start))
return jsonify({
'success': True,
'match': match,
'results': results,
'timing': time.time() - start,
})
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