149 lines
4.8 KiB
Python
149 lines
4.8 KiB
Python
# Import the urllib.parse, enum and dataclasses modules
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import dataclasses
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import urllib.parse
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import urllib.request
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from dataclasses import dataclass
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from enum import Enum, member
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from pathlib import Path
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from typing import Any
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from .errors import ClanError
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# Define an enum with different members that have different values
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class ClanUrl(Enum):
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# Use the dataclass decorator to add fields and methods to the members
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@member
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@dataclass
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class REMOTE:
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url: str # The url field holds the HTTP URL
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def __str__(self) -> str:
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return f"REMOTE({self.url})" # The __str__ method returns a custom string representation
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@member
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@dataclass
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class LOCAL:
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path: Path # The path field holds the local path
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def __str__(self) -> str:
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return f"LOCAL({self.path})" # The __str__ method returns a custom string representation
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# Parameters defined here will be DELETED from the nested uri
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# so make sure there are no conflicts with other webservices
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@dataclass
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class MachineParams:
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dummy_opt: str = "dummy"
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@dataclass
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class MachineData:
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name: str = "defaultVM"
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params: MachineParams = dataclasses.field(default_factory=MachineParams)
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# Define the ClanURI class
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class ClanURI:
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_orig_uri: str
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_nested_uri: str
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_components: urllib.parse.ParseResult
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url: ClanUrl
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machines: list[MachineData]
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# Initialize the class with a clan:// URI
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def __init__(self, uri: str) -> None:
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self.machines = []
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# users might copy whitespace along with the uri
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uri = uri.strip()
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self._orig_uri = uri
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# Check if the URI starts with clan://
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# If it does, remove the clan:// prefix
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if uri.startswith("clan://"):
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self._nested_uri = uri[7:]
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else:
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raise ClanError(f"Invalid uri: expected clan://, got {uri}")
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# Parse the URI into components
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# url://netloc/path;parameters?query#fragment
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self._components = urllib.parse.urlparse(self._nested_uri)
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# Replace the query string in the components with the new query string
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clean_comps = self._components._replace(
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query=self._components.query, fragment=""
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)
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# Parse the URL into a ClanUrl object
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self.url = self._parse_url(clean_comps)
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# Parse the fragment into a list of machine queries
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# Then parse every machine query into a MachineParameters object
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machine_frags = list(
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filter(lambda x: len(x) > 0, self._components.fragment.split("#"))
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)
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for machine_frag in machine_frags:
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machine = self._parse_machine_query(machine_frag)
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self.machines.append(machine)
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# If there are no machine fragments, add a default machine
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if len(machine_frags) == 0:
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self.machines.append(MachineData())
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def _parse_url(self, comps: urllib.parse.ParseResult) -> ClanUrl:
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comb = (
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comps.scheme,
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comps.netloc,
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comps.path,
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comps.params,
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comps.query,
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comps.fragment,
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)
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match comb:
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case ("file", "", path, "", "", _) | ("", "", path, "", "", _): # type: ignore
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url = ClanUrl.LOCAL.value(Path(path).expanduser().resolve()) # type: ignore
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case _:
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url = ClanUrl.REMOTE.value(comps.geturl()) # type: ignore
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return url
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def _parse_machine_query(self, machine_frag: str) -> MachineData:
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comp = urllib.parse.urlparse(machine_frag)
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query = urllib.parse.parse_qs(comp.query)
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machine_name = comp.path
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machine_params: dict[str, Any] = {}
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for dfield in dataclasses.fields(MachineParams):
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if dfield.name in query:
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values = query[dfield.name]
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if len(values) > 1:
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raise ClanError(f"Multiple values for parameter: {dfield.name}")
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machine_params[dfield.name] = values[0]
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# Remove the field from the query dictionary
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# clan uri and nested uri share one namespace for query parameters
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# we need to make sure there are no conflicts
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del query[dfield.name]
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params = MachineParams(**machine_params)
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machine = MachineData(name=machine_name, params=params)
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return machine
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def get_orig_uri(self) -> str:
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return self._orig_uri
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def get_url(self) -> str:
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match self.url:
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case ClanUrl.LOCAL.value(path):
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return str(path)
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case ClanUrl.REMOTE.value(url):
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return url
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case _:
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raise ClanError(f"Unsupported uri components: {self.url}")
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def __str__(self) -> str:
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return self.get_orig_uri()
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def __repr__(self) -> str:
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return f"ClanURI({self})"
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