1 files changed, 99 insertions, 0 deletions
diff --git a/searx/engines/currency_convert.py b/searx/engines/currency_convert.py
new file mode 100644
index 000000000..8eab8f673
--- /dev/null
+++ b/searx/engines/currency_convert.py
@@ -0,0 +1,99 @@
+import json
+import re
+import os
+import sys
+import unicodedata
+
+from io import open
+from datetime import datetime
+
+if sys.version_info[0] == 3:
+    unicode = str
+
+categories = []
+url = 'https://duckduckgo.com/js/spice/currency/1/{0}/{1}'
+weight = 100
+
+parser_re = re.compile(b'.*?(\\d+(?:\\.\\d+)?) ([^.0-9]+) (?:in|to) ([^.0-9]+)', re.I)
+
+db = 1
+
+
+def normalize_name(name):
+    name = name.decode('utf-8').lower().replace('-', ' ').rstrip('s')
+    name = re.sub(' +', ' ', name)
+    return unicodedata.normalize('NFKD', name).lower()
+
+
+def name_to_iso4217(name):
+    global db
+
+    name = normalize_name(name)
+    currencies = db['names'].get(name, [name])
+    return currencies[0]
+
+
+def iso4217_to_name(iso4217, language):
+    global db
+
+    return db['iso4217'].get(iso4217, {}).get(language, iso4217)
+
+
+def request(query, params):
+    m = parser_re.match(query)
+    if not m:
+        # wrong query
+        return params
+    amount, from_currency, to_currency = m.groups()
+    amount = float(amount)
+    from_currency = name_to_iso4217(from_currency.strip())
+    to_currency = name_to_iso4217(to_currency.strip())
+
+    q = (from_currency + to_currency).upper()
+
+    params['url'] = url.format(from_currency, to_currency)
+    params['amount'] = amount
+    params['from'] = from_currency
+    params['to'] = to_currency
+    params['from_name'] = iso4217_to_name(from_currency, 'en')
+    params['to_name'] = iso4217_to_name(to_currency, 'en')
+
+    return params
+
+
+def response(resp):
+    """remove first and last lines to get only json"""
+    json_resp = resp.text[resp.text.find('\n') + 1:resp.text.rfind('\n') - 2]
+    results = []
+    try:
+        conversion_rate = float(json.loads(json_resp)['conversion']['converted-amount'])
+    except:
+        return results
+    answer = '{0} {1} = {2} {3}, 1 {1} ({5}) = {4} {3} ({6})'.format(
+        resp.search_params['amount'],
+        resp.search_params['from'],
+        resp.search_params['amount'] * conversion_rate,
+        resp.search_params['to'],
+        conversion_rate,
+        resp.search_params['from_name'],
+        resp.search_params['to_name'],
+    )
+
+    url = 'https://duckduckgo.com/js/spice/currency/1/{0}/{1}'.format(
+        resp.search_params['from'].upper(), resp.search_params['to'])
+
+    results.append({'answer': answer, 'url': url})
+
+    return results
+
+
+def load():
+    global db
+
+    current_dir = os.path.dirname(os.path.realpath(__file__))
+    json_data = open(current_dir + "/../data/currencies.json", 'r', encoding='utf-8').read()
+
+    db = json.loads(json_data)
+
+
+load()