1 files changed, 175 insertions, 0 deletions
diff --git a/mitmproxy/libmproxy/utils.py b/mitmproxy/libmproxy/utils.py
new file mode 100644
index 00000000..a697a637
--- /dev/null
+++ b/mitmproxy/libmproxy/utils.py
@@ -0,0 +1,175 @@
+from __future__ import (absolute_import, print_function, division)
+import os
+import datetime
+import re
+import time
+import json
+
+
+def timestamp():
+    """
+        Returns a serializable UTC timestamp.
+    """
+    return time.time()
+
+
+def format_timestamp(s):
+    s = time.localtime(s)
+    d = datetime.datetime.fromtimestamp(time.mktime(s))
+    return d.strftime("%Y-%m-%d %H:%M:%S")
+
+
+def format_timestamp_with_milli(s):
+    d = datetime.datetime.fromtimestamp(s)
+    return d.strftime("%Y-%m-%d %H:%M:%S.%f")[:-3]
+
+
+def isBin(s):
+    """
+        Does this string have any non-ASCII characters?
+    """
+    for i in s:
+        i = ord(i)
+        if i < 9 or 13 < i < 32 or 126 < i:
+            return True
+    return False
+
+
+def isMostlyBin(s):
+    s = s[:100]
+    return sum(isBin(ch) for ch in s) / len(s) > 0.3
+
+
+def isXML(s):
+    for i in s:
+        if i in "\n \t":
+            continue
+        elif i == "<":
+            return True
+        else:
+            return False
+
+
+def pretty_json(s):
+    try:
+        p = json.loads(s)
+    except ValueError:
+        return None
+    return json.dumps(p, sort_keys=True, indent=4)
+
+
+def pretty_duration(secs):
+    formatters = [
+        (100, "{:.0f}s"),
+        (10, "{:2.1f}s"),
+        (1, "{:1.2f}s"),
+    ]
+
+    for limit, formatter in formatters:
+        if secs >= limit:
+            return formatter.format(secs)
+    # less than 1 sec
+    return "{:.0f}ms".format(secs * 1000)
+
+
+class Data:
+
+    def __init__(self, name):
+        m = __import__(name)
+        dirname, _ = os.path.split(m.__file__)
+        self.dirname = os.path.abspath(dirname)
+
+    def path(self, path):
+        """
+            Returns a path to the package data housed at 'path' under this
+            module.Path can be a path to a file, or to a directory.
+
+            This function will raise ValueError if the path does not exist.
+        """
+        fullpath = os.path.join(self.dirname, path)
+        if not os.path.exists(fullpath):
+            raise ValueError("dataPath: %s does not exist." % fullpath)
+        return fullpath
+pkg_data = Data(__name__)
+
+
+class LRUCache:
+
+    """
+        A simple LRU cache for generated values.
+    """
+
+    def __init__(self, size=100):
+        self.size = size
+        self.cache = {}
+        self.cacheList = []
+
+    def get(self, gen, *args):
+        """
+            gen: A (presumably expensive) generator function. The identity of
+            gen is NOT taken into account by the cache.
+            *args: A list of immutable arguments, used to establish identiy by
+            *the cache, and passed to gen to generate values.
+        """
+        if args in self.cache:
+            self.cacheList.remove(args)
+            self.cacheList.insert(0, args)
+            return self.cache[args]
+        else:
+            ret = gen(*args)
+            self.cacheList.insert(0, args)
+            self.cache[args] = ret
+            if len(self.cacheList) > self.size:
+                d = self.cacheList.pop()
+                self.cache.pop(d)
+            return ret
+
+
+def clean_hanging_newline(t):
+    """
+        Many editors will silently add a newline to the final line of a
+        document (I'm looking at you, Vim). This function fixes this common
+        problem at the risk of removing a hanging newline in the rare cases
+        where the user actually intends it.
+    """
+    if t and t[-1] == "\n":
+        return t[:-1]
+    return t
+
+
+def parse_size(s):
+    """
+        Parses a size specification. Valid specifications are:
+
+            123: bytes
+            123k: kilobytes
+            123m: megabytes
+            123g: gigabytes
+    """
+    if not s:
+        return None
+    mult = None
+    if s[-1].lower() == "k":
+        mult = 1024**1
+    elif s[-1].lower() == "m":
+        mult = 1024**2
+    elif s[-1].lower() == "g":
+        mult = 1024**3
+
+    if mult:
+        s = s[:-1]
+    else:
+        mult = 1
+    try:
+        return int(s) * mult
+    except ValueError:
+        raise ValueError("Invalid size specification: %s" % s)
+
+
+def safe_subn(pattern, repl, target, *args, **kwargs):
+    """
+        There are Unicode conversion problems with re.subn. We try to smooth
+        that over by casting the pattern and replacement to strings. We really
+        need a better solution that is aware of the actual content ecoding.
+    """
+    return re.subn(str(pattern), str(repl), target, *args, **kwargs)