Package multipart implements MIME multipart parsing, as defined in RFC 2046.
The implementation is sufficient for HTTP (RFC 2388) and the multipart bodies generated by popular browsers.
Limits ΒΆTo protect against malicious inputs, this package sets limits on the size of the MIME data it processes.
Reader.NextPart and Reader.NextRawPart limit the number of headers in a part to 10000 and Reader.ReadForm limits the total number of headers in all FileHeaders to 10000. These limits may be adjusted with the GODEBUG=multipartmaxheaders=<values> setting.
Reader.ReadForm further limits the number of parts in a form to 1000. This limit may be adjusted with the GODEBUG=multipartmaxparts=<value> setting.
This section is empty.
ErrMessageTooLarge is returned by ReadForm if the message form data is too large to be processed.
This section is empty.
File is an interface to access the file part of a multipart message. Its contents may be either stored in memory or on disk. If stored on disk, the File's underlying concrete type will be an *os.File.
type FileHeader struct {
}
A FileHeader describes a file part of a multipart request.
Open opens and returns the FileHeader's associated File.
Form is a parsed multipart form. Its File parts are stored either in memory or on disk, and are accessible via the *FileHeader's Open method. Its Value parts are stored as strings. Both are keyed by field name.
RemoveAll removes any temporary files associated with a Form.
A Part represents a single part in a multipart body.
FileName returns the filename parameter of the Part's Content-Disposition header. If not empty, the filename is passed through filepath.Base (which is platform dependent) before being returned.
FormName returns the name parameter if p has a Content-Disposition of type "form-data". Otherwise it returns the empty string.
Read reads the body of a part, after its headers and before the next part (if any) begins.
Reader is an iterator over parts in a MIME multipart body. Reader's underlying parser consumes its input as needed. Seeking isn't supported.
NewReader creates a new multipart Reader reading from r using the given MIME boundary.
The boundary is usually obtained from the "boundary" parameter of the message's "Content-Type" header. Use mime.ParseMediaType to parse such headers.
package main
import (
"fmt"
"io"
"log"
"mime"
"mime/multipart"
"net/mail"
"strings"
)
func main() {
msg := &mail.Message{
Header: map[string][]string{
"Content-Type": {"multipart/mixed; boundary=foo"},
},
Body: strings.NewReader(
"--foo\r\nFoo: one\r\n\r\nA section\r\n" +
"--foo\r\nFoo: two\r\n\r\nAnd another\r\n" +
"--foo--\r\n"),
}
mediaType, params, err := mime.ParseMediaType(msg.Header.Get("Content-Type"))
if err != nil {
log.Fatal(err)
}
if strings.HasPrefix(mediaType, "multipart/") {
mr := multipart.NewReader(msg.Body, params["boundary"])
for {
p, err := mr.NextPart()
if err == io.EOF {
return
}
if err != nil {
log.Fatal(err)
}
slurp, err := io.ReadAll(p)
if err != nil {
log.Fatal(err)
}
fmt.Printf("Part %q: %q\n", p.Header.Get("Foo"), slurp)
}
}
}
Output: Part "one": "A section" Part "two": "And another"
NextPart returns the next part in the multipart or an error. When there are no more parts, the error io.EOF is returned.
As a special case, if the "Content-Transfer-Encoding" header has a value of "quoted-printable", that header is instead hidden and the body is transparently decoded during Read calls.
NextRawPart returns the next part in the multipart or an error. When there are no more parts, the error io.EOF is returned.
Unlike Reader.NextPart, it does not have special handling for "Content-Transfer-Encoding: quoted-printable".
ReadForm parses an entire multipart message whose parts have a Content-Disposition of "form-data". It stores up to maxMemory bytes + 10MB (reserved for non-file parts) in memory. File parts which can't be stored in memory will be stored on disk in temporary files. It returns ErrMessageTooLarge if all non-file parts can't be stored in memory.
A Writer generates multipart messages.
NewWriter returns a new multipart Writer with a random boundary, writing to w.
Boundary returns the Writer's boundary.
Close finishes the multipart message and writes the trailing boundary end line to the output.
CreateFormFile is a convenience wrapper around Writer.CreatePart. It creates a new form-data header with the provided field name and file name.
CreatePart creates a new multipart section with the provided header. The body of the part should be written to the returned Writer. After calling CreatePart, any previous part may no longer be written to.
FormDataContentType returns the Content-Type for an HTTP multipart/form-data with this Writer's Boundary.
SetBoundary overrides the Writer's default randomly-generated boundary separator with an explicit value.
SetBoundary must be called before any parts are created, may only contain certain ASCII characters, and must be non-empty and at most 70 bytes long.
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