import hashlib
import os

def strip_path(path):
    #This leaves whitespace inside quotes and only a single "
    #thus ' ""test"' -> '"test'
    #consider path.strip(string.whitespace+"\"")
    #or weightier re.fullmatch("[\\s\"]*(.+?)[\\s\"]*", path).group(1)
    path = path.strip()
    if path.startswith("\""):
        path = path[1:]
    if path.endswith("\""):
        path = path[:-1]
    return path

# modified from https://stackoverflow.com/questions/22058048/hashing-a-file-in-python
def calculate_file_hash(filename: str, hash_every_n: int = 1):
    #Larger video files were taking >.5 seconds to hash even when cached,
    #so instead the modified time from the filesystem is used as a hash
    h = hashlib.sha256()
    h.update(filename.encode())
    h.update(str(os.path.getmtime(filename)).encode())
    return h.hexdigest()

def is_safe_path(path, strict=False):
    if "VCW_STRICT_PATHS" not in os.environ and not strict:
        return True
    basedir = os.path.abspath('.')
    try:
        common_path = os.path.commonpath([basedir, path])
    except:
        #Different drive on windows
        return False
    return common_path == basedir