def fetch_uri_contents(self, uri: str) -> bytes:
ipfs_hash = extract_ipfs_path_from_uri(uri)
contents = self.client.cat(ipfs_hash)
validation_hash = generate_file_hash(contents)
if validation_hash != ipfs_hash:
raise ValidationError(
f"Hashed IPFS contents retrieved from uri: {uri} do not match its content hash."
)
return contents
def from_ipfs(cls, ipfs_uri: str) -> 'Package':
"""
Instantiate a Package object from an IPFS uri.
TODO: Defaults to Infura gateway, needs extension
to support other gateways and local nodes
"""
if is_ipfs_uri(ipfs_uri):
ipfs_path = extract_ipfs_path_from_uri(ipfs_uri)
package_data = fetch_ipfs_package(ipfs_path)
else:
raise TypeError(
"The Package.from_ipfs method only accepts a valid IPFS uri."
"{0} is not a valid IPFS uri.".format(ipfs_uri))
return cls(package_data)
def test_extract_ipfs_path_from_uri(value, expected):
actual = extract_ipfs_path_from_uri(value)
assert actual == expected
def fetch_uri_contents(self, uri: str) -> bytes:
ipfs_hash = extract_ipfs_path_from_uri(uri)
gateway_uri = self.base_uri + ipfs_hash
response = requests.get(gateway_uri)
response.raise_for_status()
return response.content
def fetch_uri_contents(self, ipfs_uri: str) -> bytes:
ipfs_hash = extract_ipfs_path_from_uri(ipfs_uri)
contents = self.client.cat(ipfs_hash)
return contents