First version of csv import module

- If more than 1 misp type is recognized, for each one an
  attribute is created

- Needs to have header set by user as parameters of the module atm

- Review needed to see the feasibility with fields that can create
  confusion and be interpreted both as misp type or attribute field
  (for instance comment is a misp type and an attribute field)

misp_modules/modules/import_mod/csvimport.py

@@ -0,0 +1,113 @@
+import json, os
+import pymisp
+
+misperrors = {'error': 'Error'}
+mispattributes = {'input': ['file'], 'output': ['MISP attributes']}
+moduleinfo = {'version': '0.1', 'author': 'Christian Studer',
+              'description': 'Import Attributes from a csv file.',
+              'module-type': ['import']}
+moduleconfig = ['header']
+
+duplicatedFields = {'mispType': {'mispComment': 'comment'},
+                    'attrField': {'eventComment': 'comment'}}
+
+def handler(q=False):
+    if q is False:
+        return False
+    request = json.loads(q)
+    if request.get('file'):
+        filename = request['file']
+    else:
+        misperrors['error'] = "Unsupported attributes type"
+        return misperrors
+    if not request.get('config') and not request['config'].get('header'):
+        misperrors['error'] = "Configuration error"
+        return misperrors
+    config = request['config'].get('header')
+    header = []
+    data = []
+    with open(filename, 'r') as f:
+        for line in f:
+            # split comments from data
+            if line.startswith('#'):
+                header.append(line)
+            else:
+                data.append(line)
+    # find which delimiter is used
+    delimiter, length = findDelimiter(config, data)
+    # build the attributes
+    result = buildAttributes(config, data, delimiter, length)
+    r = {'results': [{'types': mispattributes['output'], 'values': result}]}
+    return r
+
+def findDelimiter(header, data):
+    n = len(header)
+    if n > 1:
+        for d in (';', ',', '|'):
+            if data[0].count(d) == (n-1):
+                return d, n
+                break
+    else:
+        return None, 1
+
+def buildAttributes(header, dataValues, delimiter, length):
+    attributes = []
+    # if there is only 1 field of data
+    if delimiter is None:
+        mispType = header[0]
+        for data in dataValues:
+            attributes.append({'type': mispType, 'value': data})
+    else:
+        # split fields that should be recognized as misp attribute types from the others
+        list2pop, misp, head = findMispTypes(header)
+        # for each line of data
+        for data in dataValues:
+            datamisp = []
+            datasplit = data.split(delimiter)
+            # in case there is an empty line or an error
+            if len(datasplit) != length:
+                continue
+            # pop from the line data that matches with a misp type, using the list of indexes
+            for l in list2pop:
+                datamisp.append(datasplit.pop(l).strip())
+            # for each misp type, we create an attribute
+            for m, dm in zip(misp, datamisp):
+                attribute = {'type': m, 'value': dm}
+                for h, ds in zip(head, datasplit):
+                    if h:
+                        attribute[h] = ds.strip()
+                attributes.append(attribute)
+    return attributes
+
+def findMispTypes(header):
+    descFilename = os.path.join(pymisp.__path__[0], 'data/describeTypes.json')
+    with open(descFilename, 'r') as f:
+        MispTypes = json.loads(f.read())['result'].get('types')
+    list2pop = []
+    misp = []
+    head = []
+    for h in reversed(header):
+        n = header.index(h)
+        # fields that are misp attribute types
+        if h in MispTypes:
+            list2pop.append(n)
+            misp.append(h)
+        # handle confusions between misp attribute types and attribute fields
+        elif h in duplicatedFields['mispType']:
+            # fields that should be considered as misp attribute types
+            list2pop.append(n)
+            misp.append(duplicatedFields['mispType'].get(h))
+        elif h in duplicatedFields['attrField']:
+            # fields that should be considered as attribute fields
+            head.append(duplicatedFields['attrField'].get(h))
+        else:
+            head.append(h)
+    # return list of indexes of the misp types, list of the misp types, remaining fields that will be attribute fields
+    return list2pop, misp, head
+
+def introspection():
+    return mispattributes
+
+def version():
+    moduleinfo['config'] = moduleconfig
+    return moduleinfo