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|
package magic
import (
"bufio"
"bytes"
"strings"
"time"
"github.com/gabriel-vasile/mimetype/internal/charset"
"github.com/gabriel-vasile/mimetype/internal/json"
)
var (
// HTML matches a Hypertext Markup Language file.
HTML = markup(
[]byte("<!DOCTYPE HTML"),
[]byte("<HTML"),
[]byte("<HEAD"),
[]byte("<SCRIPT"),
[]byte("<IFRAME"),
[]byte("<H1"),
[]byte("<DIV"),
[]byte("<FONT"),
[]byte("<TABLE"),
[]byte("<A"),
[]byte("<STYLE"),
[]byte("<TITLE"),
[]byte("<B"),
[]byte("<BODY"),
[]byte("<BR"),
[]byte("<P"),
)
// XML matches an Extensible Markup Language file.
XML = markup([]byte("<?XML"))
// Owl2 matches an Owl ontology file.
Owl2 = xml(newXMLSig("Ontology", `xmlns="http://www.w3.org/2002/07/owl#"`))
// Rss matches a Rich Site Summary file.
Rss = xml(newXMLSig("rss", ""))
// Atom matches an Atom Syndication Format file.
Atom = xml(newXMLSig("feed", `xmlns="http://www.w3.org/2005/Atom"`))
// Kml matches a Keyhole Markup Language file.
Kml = xml(
newXMLSig("kml", `xmlns="http://www.opengis.net/kml/2.2"`),
newXMLSig("kml", `xmlns="http://earth.google.com/kml/2.0"`),
newXMLSig("kml", `xmlns="http://earth.google.com/kml/2.1"`),
newXMLSig("kml", `xmlns="http://earth.google.com/kml/2.2"`),
)
// Xliff matches a XML Localization Interchange File Format file.
Xliff = xml(newXMLSig("xliff", `xmlns="urn:oasis:names:tc:xliff:document:1.2"`))
// Collada matches a COLLAborative Design Activity file.
Collada = xml(newXMLSig("COLLADA", `xmlns="http://www.collada.org/2005/11/COLLADASchema"`))
// Gml matches a Geography Markup Language file.
Gml = xml(
newXMLSig("", `xmlns:gml="http://www.opengis.net/gml"`),
newXMLSig("", `xmlns:gml="http://www.opengis.net/gml/3.2"`),
newXMLSig("", `xmlns:gml="http://www.opengis.net/gml/3.3/exr"`),
)
// Gpx matches a GPS Exchange Format file.
Gpx = xml(newXMLSig("gpx", `xmlns="http://www.topografix.com/GPX/1/1"`))
// Tcx matches a Training Center XML file.
Tcx = xml(newXMLSig("TrainingCenterDatabase", `xmlns="http://www.garmin.com/xmlschemas/TrainingCenterDatabase/v2"`))
// X3d matches an Extensible 3D Graphics file.
X3d = xml(newXMLSig("X3D", `xmlns:xsd="http://www.w3.org/2001/XMLSchema-instance"`))
// Amf matches an Additive Manufacturing XML file.
Amf = xml(newXMLSig("amf", ""))
// Threemf matches a 3D Manufacturing Format file.
Threemf = xml(newXMLSig("model", `xmlns="http://schemas.microsoft.com/3dmanufacturing/core/2015/02"`))
// Xfdf matches a XML Forms Data Format file.
Xfdf = xml(newXMLSig("xfdf", `xmlns="http://ns.adobe.com/xfdf/"`))
// VCard matches a Virtual Contact File.
VCard = ciPrefix([]byte("BEGIN:VCARD\n"), []byte("BEGIN:VCARD\r\n"))
// ICalendar matches a iCalendar file.
ICalendar = ciPrefix([]byte("BEGIN:VCALENDAR\n"), []byte("BEGIN:VCALENDAR\r\n"))
phpPageF = ciPrefix(
[]byte("<?PHP"),
[]byte("<?\n"),
[]byte("<?\r"),
[]byte("<? "),
)
phpScriptF = shebang(
[]byte("/usr/local/bin/php"),
[]byte("/usr/bin/php"),
[]byte("/usr/bin/env php"),
)
// Js matches a Javascript file.
Js = shebang(
[]byte("/bin/node"),
[]byte("/usr/bin/node"),
[]byte("/bin/nodejs"),
[]byte("/usr/bin/nodejs"),
[]byte("/usr/bin/env node"),
[]byte("/usr/bin/env nodejs"),
)
// Lua matches a Lua programming language file.
Lua = shebang(
[]byte("/usr/bin/lua"),
[]byte("/usr/local/bin/lua"),
[]byte("/usr/bin/env lua"),
)
// Perl matches a Perl programming language file.
Perl = shebang(
[]byte("/usr/bin/perl"),
[]byte("/usr/bin/env perl"),
)
// Python matches a Python programming language file.
Python = shebang(
[]byte("/usr/bin/python"),
[]byte("/usr/local/bin/python"),
[]byte("/usr/bin/env python"),
)
// Tcl matches a Tcl programming language file.
Tcl = shebang(
[]byte("/usr/bin/tcl"),
[]byte("/usr/local/bin/tcl"),
[]byte("/usr/bin/env tcl"),
[]byte("/usr/bin/tclsh"),
[]byte("/usr/local/bin/tclsh"),
[]byte("/usr/bin/env tclsh"),
[]byte("/usr/bin/wish"),
[]byte("/usr/local/bin/wish"),
[]byte("/usr/bin/env wish"),
)
// Rtf matches a Rich Text Format file.
Rtf = prefix([]byte("{\\rtf1"))
)
// Text matches a plain text file.
//
// TODO: This function does not parse BOM-less UTF16 and UTF32 files. Not really
// sure it should. Linux file utility also requires a BOM for UTF16 and UTF32.
func Text(raw []byte, limit uint32) bool {
// First look for BOM.
if cset := charset.FromBOM(raw); cset != "" {
return true
}
// Binary data bytes as defined here: https://mimesniff.spec.whatwg.org/#binary-data-byte
for _, b := range raw {
if b <= 0x08 ||
b == 0x0B ||
0x0E <= b && b <= 0x1A ||
0x1C <= b && b <= 0x1F {
return false
}
}
return true
}
// Php matches a PHP: Hypertext Preprocessor file.
func Php(raw []byte, limit uint32) bool {
if res := phpPageF(raw, limit); res {
return res
}
return phpScriptF(raw, limit)
}
// JSON matches a JavaScript Object Notation file.
func JSON(raw []byte, limit uint32) bool {
raw = trimLWS(raw)
// #175 A single JSON string, number or bool is not considered JSON.
// JSON objects and arrays are reported as JSON.
if len(raw) < 2 || (raw[0] != '[' && raw[0] != '{') {
return false
}
parsed, err := json.Scan(raw)
// If the full file content was provided, check there is no error.
if limit == 0 || len(raw) < int(limit) {
return err == nil
}
// If a section of the file was provided, check if all of it was parsed.
return parsed == len(raw) && len(raw) > 0
}
// GeoJSON matches a RFC 7946 GeoJSON file.
//
// GeoJSON detection implies searching for key:value pairs like: `"type": "Feature"`
// in the input.
// BUG(gabriel-vasile): The "type" key should be searched for in the root object.
func GeoJSON(raw []byte, limit uint32) bool {
raw = trimLWS(raw)
if len(raw) == 0 {
return false
}
// GeoJSON is always a JSON object, not a JSON array or any other JSON value.
if raw[0] != '{' {
return false
}
s := []byte(`"type"`)
si, sl := bytes.Index(raw, s), len(s)
if si == -1 {
return false
}
// If the "type" string is the suffix of the input,
// there is no need to search for the value of the key.
if si+sl == len(raw) {
return false
}
// Skip the "type" part.
raw = raw[si+sl:]
// Skip any whitespace before the colon.
raw = trimLWS(raw)
// Check for colon.
if len(raw) == 0 || raw[0] != ':' {
return false
}
// Skip any whitespace after the colon.
raw = trimLWS(raw[1:])
geoJSONTypes := [][]byte{
[]byte(`"Feature"`),
[]byte(`"FeatureCollection"`),
[]byte(`"Point"`),
[]byte(`"LineString"`),
[]byte(`"Polygon"`),
[]byte(`"MultiPoint"`),
[]byte(`"MultiLineString"`),
[]byte(`"MultiPolygon"`),
[]byte(`"GeometryCollection"`),
}
for _, t := range geoJSONTypes {
if bytes.HasPrefix(raw, t) {
return true
}
}
return false
}
// NdJSON matches a Newline delimited JSON file. All complete lines from raw
// must be valid JSON documents meaning they contain one of the valid JSON data
// types.
func NdJSON(raw []byte, limit uint32) bool {
lCount, hasObjOrArr := 0, false
sc := bufio.NewScanner(dropLastLine(raw, limit))
for sc.Scan() {
l := sc.Bytes()
// Empty lines are allowed in NDJSON.
if l = trimRWS(trimLWS(l)); len(l) == 0 {
continue
}
_, err := json.Scan(l)
if err != nil {
return false
}
if l[0] == '[' || l[0] == '{' {
hasObjOrArr = true
}
lCount++
}
return lCount > 1 && hasObjOrArr
}
// HAR matches a HAR Spec file.
// Spec: http://www.softwareishard.com/blog/har-12-spec/
func HAR(raw []byte, limit uint32) bool {
s := []byte(`"log"`)
si, sl := bytes.Index(raw, s), len(s)
if si == -1 {
return false
}
// If the "log" string is the suffix of the input,
// there is no need to search for the value of the key.
if si+sl == len(raw) {
return false
}
// Skip the "log" part.
raw = raw[si+sl:]
// Skip any whitespace before the colon.
raw = trimLWS(raw)
// Check for colon.
if len(raw) == 0 || raw[0] != ':' {
return false
}
// Skip any whitespace after the colon.
raw = trimLWS(raw[1:])
harJSONTypes := [][]byte{
[]byte(`"version"`),
[]byte(`"creator"`),
[]byte(`"entries"`),
}
for _, t := range harJSONTypes {
si := bytes.Index(raw, t)
if si > -1 {
return true
}
}
return false
}
// Svg matches a SVG file.
func Svg(raw []byte, limit uint32) bool {
return bytes.Contains(raw, []byte("<svg"))
}
// Srt matches a SubRip file.
func Srt(in []byte, _ uint32) bool {
s := bufio.NewScanner(bytes.NewReader(in))
if !s.Scan() {
return false
}
// First line must be 1.
if s.Text() != "1" {
return false
}
if !s.Scan() {
return false
}
secondLine := s.Text()
// Timestamp format (e.g: 00:02:16,612 --> 00:02:19,376) limits secondLine
// length to exactly 29 characters.
if len(secondLine) != 29 {
return false
}
// Decimal separator of fractional seconds in the timestamps must be a
// comma, not a period.
if strings.Contains(secondLine, ".") {
return false
}
// For Go <1.17, comma is not recognised as a decimal separator by `time.Parse`.
secondLine = strings.ReplaceAll(secondLine, ",", ".")
// Second line must be a time range.
ts := strings.Split(secondLine, " --> ")
if len(ts) != 2 {
return false
}
const layout = "15:04:05.000"
t0, err := time.Parse(layout, ts[0])
if err != nil {
return false
}
t1, err := time.Parse(layout, ts[1])
if err != nil {
return false
}
if t0.After(t1) {
return false
}
// A third line must exist and not be empty. This is the actual subtitle text.
return s.Scan() && len(s.Bytes()) != 0
}
// Vtt matches a Web Video Text Tracks (WebVTT) file. See
// https://www.iana.org/assignments/media-types/text/vtt.
func Vtt(raw []byte, limit uint32) bool {
// Prefix match.
prefixes := [][]byte{
{0xEF, 0xBB, 0xBF, 0x57, 0x45, 0x42, 0x56, 0x54, 0x54, 0x0A}, // UTF-8 BOM, "WEBVTT" and a line feed
{0xEF, 0xBB, 0xBF, 0x57, 0x45, 0x42, 0x56, 0x54, 0x54, 0x0D}, // UTF-8 BOM, "WEBVTT" and a carriage return
{0xEF, 0xBB, 0xBF, 0x57, 0x45, 0x42, 0x56, 0x54, 0x54, 0x20}, // UTF-8 BOM, "WEBVTT" and a space
{0xEF, 0xBB, 0xBF, 0x57, 0x45, 0x42, 0x56, 0x54, 0x54, 0x09}, // UTF-8 BOM, "WEBVTT" and a horizontal tab
{0x57, 0x45, 0x42, 0x56, 0x54, 0x54, 0x0A}, // "WEBVTT" and a line feed
{0x57, 0x45, 0x42, 0x56, 0x54, 0x54, 0x0D}, // "WEBVTT" and a carriage return
{0x57, 0x45, 0x42, 0x56, 0x54, 0x54, 0x20}, // "WEBVTT" and a space
{0x57, 0x45, 0x42, 0x56, 0x54, 0x54, 0x09}, // "WEBVTT" and a horizontal tab
}
for _, p := range prefixes {
if bytes.HasPrefix(raw, p) {
return true
}
}
// Exact match.
return bytes.Equal(raw, []byte{0xEF, 0xBB, 0xBF, 0x57, 0x45, 0x42, 0x56, 0x54, 0x54}) || // UTF-8 BOM and "WEBVTT"
bytes.Equal(raw, []byte{0x57, 0x45, 0x42, 0x56, 0x54, 0x54}) // "WEBVTT"
}
|
