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use base64::encode;
use nu_errors::ShellError;
use nu_protocol::{CallInfo, CommandAction, ReturnSuccess, ReturnValue, UntaggedValue, Value};
use nu_source::{AnchorLocation, Span, Tag};
use std::path::PathBuf;
use std::str::FromStr;
#[derive(Default)]
pub struct Fetch {
pub path: Option<Value>,
pub tag: Tag,
pub has_raw: bool,
pub user: Option<String>,
pub password: Option<String>,
}
impl Fetch {
pub fn new() -> Fetch {
Fetch {
path: None,
tag: Tag::unknown(),
has_raw: false,
user: None,
password: None,
}
}
pub fn setup(&mut self, call_info: CallInfo) -> ReturnValue {
self.path = Some({
let file = call_info.args.nth(0).ok_or_else(|| {
ShellError::labeled_error(
"No file or directory specified",
"for command",
&call_info.name_tag,
)
})?;
file.clone()
});
self.tag = call_info.name_tag.clone();
self.has_raw = call_info.args.has("raw");
self.user = match call_info.args.get("user") {
Some(user) => Some(user.as_string()?),
None => None,
};
self.password = match call_info.args.get("password") {
Some(password) => Some(password.as_string()?),
None => None,
};
ReturnSuccess::value(UntaggedValue::nothing().into_untagged_value())
}
}
pub async fn fetch(
path: &Value,
has_raw: bool,
user: Option<String>,
password: Option<String>,
) -> ReturnValue {
let path_str = path.as_string()?;
let path_span = path.tag.span;
let result = helper(&path_str, path_span, has_raw, user, password).await;
if let Err(e) = result {
return Err(e);
}
let (file_extension, value) = result?;
let file_extension = if has_raw {
None
} else {
// If the extension could not be determined via mimetype, try to use the path
// extension. Some file types do not declare their mimetypes (such as bson files).
file_extension.or_else(|| path_str.split('.').last().map(String::from))
};
if let Some(extension) = file_extension {
Ok(ReturnSuccess::Action(CommandAction::AutoConvert(
value, extension,
)))
} else {
ReturnSuccess::value(value)
}
}
// Helper function that actually goes to retrieve the resource from the url given
// The Option<String> return a possible file extension which can be used in AutoConvert commands
async fn helper(
location: &str,
span: Span,
has_raw: bool,
user: Option<String>,
password: Option<String>,
) -> std::result::Result<(Option<String>, Value), ShellError> {
let url = match url::Url::parse(location) {
Ok(u) => u,
Err(e) => {
return Err(ShellError::labeled_error(
format!("Incomplete or incorrect url:\n{:?}", e),
"expected a full url",
span,
));
}
};
let login = match (user, password) {
(Some(user), Some(password)) => Some(encode(&format!("{}:{}", user, password))),
(Some(user), _) => Some(encode(&format!("{}:", user))),
_ => None,
};
let mut response = surf::RequestBuilder::new(surf::http::Method::Get, url)
.middleware(surf::middleware::Redirect::default());
if let Some(login) = login {
response = surf::get(location).header("Authorization", format!("Basic {}", login));
}
let generate_error = |t: &str, e: surf::Error, span: &Span| {
ShellError::labeled_error(
format!("Could not load {} from remote url: {:?}", t, e),
"could not load",
span,
)
};
let tag = Tag {
span,
anchor: Some(AnchorLocation::Url(location.to_string())),
};
match response.await {
Ok(mut r) => match r.header("content-type") {
Some(content_type) => {
let content_type_header_value = content_type.get(0);
let content_type_header_value = match content_type_header_value {
Some(h) => h,
None => {
return Err(ShellError::labeled_error(
"no content type found",
"no content type found",
span,
))
}
};
let content_type = mime::Mime::from_str(content_type_header_value.as_str())
.map_err(|_| {
ShellError::labeled_error(
format!("MIME type unknown: {}", content_type_header_value),
"given unknown MIME type",
span,
)
})?;
match (content_type.type_(), content_type.subtype()) {
(mime::APPLICATION, mime::XML) => Ok((
Some("xml".to_string()),
UntaggedValue::string(
r.body_string()
.await
.map_err(|e| generate_error("text", e, &span))?,
)
.into_value(tag),
)),
(mime::APPLICATION, mime::JSON) => Ok((
Some("json".to_string()),
UntaggedValue::string(
r.body_string()
.await
.map_err(|e| generate_error("text", e, &span))?,
)
.into_value(tag),
)),
(mime::APPLICATION, mime::OCTET_STREAM) => {
let buf: Vec<u8> = r
.body_bytes()
.await
.map_err(|e| generate_error("binary", e, &span))?;
Ok((None, UntaggedValue::binary(buf).into_value(tag)))
}
(mime::IMAGE, mime::SVG) => Ok((
Some("svg".to_string()),
UntaggedValue::string(
r.body_string()
.await
.map_err(|e| generate_error("svg", e, &span))?,
)
.into_value(tag),
)),
(mime::IMAGE, image_ty) => {
let buf: Vec<u8> = r
.body_bytes()
.await
.map_err(|e| generate_error("image", e, &span))?;
Ok((
Some(image_ty.to_string()),
UntaggedValue::binary(buf).into_value(tag),
))
}
(mime::TEXT, mime::HTML) => Ok((
Some("html".to_string()),
UntaggedValue::string(
r.body_string()
.await
.map_err(|e| generate_error("text", e, &span))?,
)
.into_value(tag),
)),
(mime::TEXT, mime::CSV) => Ok((
Some("csv".to_string()),
UntaggedValue::string(
r.body_string()
.await
.map_err(|e| generate_error("text", e, &span))?,
)
.into_value(tag),
)),
(mime::TEXT, mime::PLAIN) => {
let path_extension = url::Url::parse(location)
.map_err(|_| {
ShellError::labeled_error(
format!("Cannot parse URL: {}", location),
"cannot parse",
span,
)
})?
.path_segments()
.and_then(|segments| segments.last())
.and_then(|name| if name.is_empty() { None } else { Some(name) })
.and_then(|name| {
PathBuf::from(name)
.extension()
.map(|name| name.to_string_lossy().to_string())
});
Ok((
path_extension,
UntaggedValue::string(
r.body_string()
.await
.map_err(|e| generate_error("text", e, &span))?,
)
.into_value(tag),
))
}
(_ty, _sub_ty) if has_raw => {
let raw_bytes = r.body_bytes().await;
let raw_bytes = match raw_bytes {
Ok(r) => r,
Err(e) => {
return Err(ShellError::labeled_error(
"error with raw_bytes",
e.to_string(),
&span,
));
}
};
// For unsupported MIME types, we do not know if the data is UTF-8,
// so we get the raw body bytes and try to convert to UTF-8 if possible.
match std::str::from_utf8(&raw_bytes) {
Ok(response_str) => {
Ok((None, UntaggedValue::string(response_str).into_value(tag)))
}
Err(_) => Ok((None, UntaggedValue::binary(raw_bytes).into_value(tag))),
}
}
(ty, sub_ty) => Err(ShellError::unimplemented(format!(
"Not yet supported MIME type: {} {}",
ty, sub_ty
))),
}
}
// TODO: Should this return "nothing" or Err?
None => Ok((
None,
UntaggedValue::string("No content type found".to_owned()).into_value(tag),
)),
},
Err(e) => Err(ShellError::labeled_error(
"url could not be opened",
e.to_string(),
span,
)),
}
}