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extern crate geojson;
extern crate geo_types;
extern crate exif;
extern crate serde_json;
extern crate clap;
use std::path::Path;
use geojson::{Feature, GeoJson, Geometry, Value, FeatureCollection};
#[derive(Debug)]
enum Error {
IoError(std::io::Error),
Utf8Error(std::str::Utf8Error),
FieldMissing(exif::Tag),
InvalidField(&'static str),
ExifError(exif::Error),
}
impl std::fmt::Display for Error {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match self {
Error::IoError(error) => write!(f, "{}", error),
Error::Utf8Error(error) => write!(f, "{}", error),
Error::FieldMissing(tag) => write!(f, "{}", tag),
Error::InvalidField(msg) => write!(f, "invalid field: {}", msg),
Error::ExifError(error) => write!(f, "{}", error),
}
}
}
impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match self {
Error::IoError(e) => Some(e),
Error::Utf8Error(e) => Some(e),
Error::ExifError(e) => Some(e),
_ => None,
}
}
}
impl From<std::str::Utf8Error> for Error {
fn from(value: std::str::Utf8Error) -> Error {
Error::Utf8Error(value)
}
}
impl From<std::io::Error> for Error {
fn from(value: std::io::Error) -> Error {
Error::IoError(value)
}
}
impl From<exif::Error> for Error {
fn from(value: exif::Error) -> Error {
Error::ExifError(value)
}
}
type Result<T> = std::result::Result<T, Error>;
fn get_degrees(reader: &exif::Reader, tag: exif::Tag) -> Result<f64> {
let field = reader.get_field(tag, false).ok_or(Error::FieldMissing(tag))?;
match field.value {
exif::Value::Rational(ref dms) => {
if dms.len() != 3 {
return Err(Error::InvalidField("expected 3 rationals"))
}
let degrees = dms[0].to_f64();
let min = dms[1].to_f64();
let sec = dms[2].to_f64();
Ok(degrees + min/60.0 + sec/3600.0)
},
_ => Err(Error::InvalidField("invalid field type"))
}
}
fn get_string(reader: &exif::Reader, tag: exif::Tag) -> Result<&str> {
let field = reader.get_field(tag, false).ok_or(Error::FieldMissing(tag))?;
if let exif::Value::Ascii(ref s) = field.value {
let s = s[0];
std::str::from_utf8(s).map_err(|err| err.into())
} else {
Err(Error::InvalidField("field is not a string"))
}
}
fn get_latitude(reader: &exif::Reader) -> Result<f64> {
let mut latitude = get_degrees(reader, exif::Tag::GPSLatitude)?;
let ref_ = get_string(reader, exif::Tag::GPSLatitudeRef)?;
if ref_.ends_with("S") {
latitude = -latitude;
}
Ok(latitude)
}
fn get_longitude(reader: &exif::Reader) -> Result<f64> {
let mut longitude = get_degrees(reader, exif::Tag::GPSLongitude)?;
let ref_ = get_string(reader, exif::Tag::GPSLongitudeRef)?;
if ref_.ends_with("W") {
longitude = -longitude;
}
Ok(longitude)
}
fn get_coordinates<P: AsRef<Path> + ?Sized>(filename: &P) -> Result<geo_types::Point<f64>> {
let file = std::fs::File::open(filename)?;
let reader = exif::Reader::new(&mut std::io::BufReader::new(&file))?;
let latitude = get_latitude(&reader)?;
let longitude = get_longitude(&reader)?;
Ok((longitude, latitude).into())
}
fn main() {
let matches = clap::App::new("plag")
.version("0.1")
.author("Oskari Timperi <oskari.timperi@iki.fi>")
.about("Photo Location As GeoJSON - Extract GPS location from photos to GeoJSON")
.arg(clap::Arg::with_name("pretty")
.long("pretty")
.help("Output human-readable GeoJSON"))
.arg(clap::Arg::with_name("files")
.required(true)
.multiple(true)
.help("A list of photos"))
.get_matches();
// "files" is a required argument. Should be quite safe to unwrap.
let files = matches.values_of_os("files").unwrap();
let features: Vec<_> = files.into_iter()
.map(|path| (path, get_coordinates(&path)))
.filter_map(|x| {
match x {
(_, Ok(coord)) => Some(coord),
(path, Err(err)) => {
eprintln!("{}: {}", path.to_string_lossy(), err);
None
}
}
})
.map(|point| {
Feature {
bbox: None,
geometry: Some(Geometry::new(Value::from(&point))),
id: None,
properties: None,
foreign_members: None,
}
})
.collect();
let collection = FeatureCollection {
bbox: None,
features: features,
foreign_members: None,
};
let geojson = GeoJson::from(collection);
if matches.is_present("pretty") {
serde_json::to_writer_pretty(std::io::stdout(), &geojson).unwrap();
} else {
serde_json::to_writer(std::io::stdout(), &geojson).unwrap();
}
}
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