def is_supported_content_addressed_uri(uri: URI) -> bool:
"""
Returns a bool indicating whether provided uri is currently supported.
Currently Py-EthPM only supports IPFS and Github blob content-addressed uris.
"""
if not is_ipfs_uri(uri) and not is_valid_content_addressed_github_uri(uri):
return False
return True
def fetch_uri_contents(self, ipfs_uri: str) -> bytes:
if is_ipfs_uri(ipfs_uri):
with open(str(V2_PACKAGES_DIR / "safe-math-lib" /
"1.0.0.json")) as file_obj:
contents = file_obj.read()
else:
with open(str(V2_PACKAGES_DIR / ipfs_uri)) as file_obj:
contents = file_obj.read()
return to_bytes(text=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_is_ipfs_uri(value, expected):
actual = is_ipfs_uri(value)
assert actual is expected
def validate_ipfs_uri(uri: str) -> None:
"""
Raise an exception if the provided URI is not a valid IPFS URI.
"""
if not is_ipfs_uri(uri):
raise ValidationError(f"URI: {uri} is not a valid IPFS URI.")
def can_resolve_uri(self, uri: str) -> bool:
"""
Return a bool indicating whether or not this backend
is capable of serving the content located at the URI.
"""
return is_ipfs_uri(uri)
def validate_is_supported_manifest_uri(uri):
if not is_ipfs_uri(uri) and not is_valid_content_addressed_github_uri(uri):
raise ManifestValidationError(
f"URI: {uri} is not a valid content-addressed URI. "
"Currently only IPFS and Github content-addressed URIs are supported."
)
def can_handle_uri(self, uri: str) -> bool:
if is_ipfs_uri(uri):
return True
path = V2_PACKAGES_DIR / uri
return path.exists()