func Auth_BasicCheck(username, password string) (string, error) {
hashed := checksum.String(password, crypto.SHA512)
return Auth_HashedCheck(username, hashed)
}
/*
Renders a LaTeX string, returns a PNG image path.
*/
func (self *Renderer) Render(latex string) (string, error) {
var err error
name := checksum.String(latex, crypto.SHA1)
// Relative output directory.
relPath := name[0:4] + PS + name[4:8] + PS + name[8:12] + PS + name[12:16] + PS + name[16:] + ".png"
// Setting output directory.
pngPath := OutputDirectory + PS + relPath
err = os.MkdirAll(path.Dir(pngPath), 0755)
if err != nil {
return "", err
}
// Does the output file already exists?
if self.UseCache == true {
_, err = os.Stat(pngPath)
if err == nil {
return relPath, nil
}
}
// Setting working directory.
workdir := WorkingDirectory + PS + name
err = os.MkdirAll(workdir, 0755)
if err != nil {
return "", err
}
// Will clean the directory at the end.
defer os.RemoveAll(workdir)
// Writing LaTeX to a file.
texFile, err := os.Create(workdir + PS + "output.tex")
if err != nil {
return "", err
}
defer texFile.Close()
_, err = io.WriteString(texFile, latex)
if err != nil {
return "", err
}
// Temp files.
dviPath := workdir + PS + "output.dvi"
epsPath := workdir + PS + "output.eps"
// LaTeX toolchain
batch := []*exec.Cmd{
exec.Command(
"latex",
"-no-shell-escape",
"-interaction=batchmode",
fmt.Sprintf("-output-directory=%s", workdir),
texFile.Name(),
),
exec.Command(
"dvips",
"-G",
"-R2",
"-E",
dviPath,
"-o",
epsPath,
),
exec.Command(
"convert",
"+adjoin",
"-density",
to.String(self.Density),
"-antialias",
epsPath,
pngPath,
),
}
// Executing toolchain.
os.Setenv("openout_any", "p")
for _, cmd := range batch {
err = cmd.Run()
if err != nil {
// Trying to catch error
logPath := workdir + PS + "output.log"
logFile, err := os.Open(logPath)
if err == nil {
buf := bytes.NewBuffer(nil)
buf.ReadFrom(logFile)
logFile.Close()
if buf.Len() > 0 {
return "", errors.New(string(buf.Bytes()))
}
}
return "", err
}
}
// Had success?
stat, err := os.Stat(pngPath)
if err != nil || stat == nil {
return "", errors.New("Failed to create PNG file.")
}
return relPath, err
}
