/*
 * http_alias.c: Stuff for dealing with directory aliases
 * 
 * All code contained herein is covered by the Copyright as distributed
 * in the README file in the main directory of the distribution of 
 * NCSA HTTPD.
 *
 * Based on NCSA HTTPd 1.3 by Rob McCool
 * 
 *  04-06-95 blong
 * 	Added Saved_ variables to allow reset of aliases to configured 
 *	only.  save_aliases is called from http_config, and 
 *	reset_to_saved_alias is called in the initialization of 
 *	transactions.
 */


#include "httpd.h"

typedef struct {
    char fake[MAX_STRING_LEN];
    char real[MAX_STRING_LEN];
    int script;
} alias;

static int Saved_num_alias = 0;
static int num_a = 0;
static alias a[MAX_ALIASES];
static int Saved_num_redirect = 0;
static int num_v = 0;
static alias v[MAX_ALIASES];

/* To send stat() information to http_script.c */
int dirs_in_alias;

void reset_aliases() {
    num_a = 0;
    num_v = 0;
}

void save_aliases() {
    Saved_num_alias = num_a;
    Saved_num_redirect = num_v;
}

void reset_to_saved_aliases() {
    num_a = Saved_num_alias;
    num_v = Saved_num_redirect;
}

void add_alias(char *f, char *r, int is_script) {
    if (num_a >= MAX_ALIASES)
      num_a = Saved_num_alias;
    strcpy(a[num_a].fake,f);

    a[num_a].script = is_script;
    if(r[0] != '/') 
        make_full_path((is_script ? server_root : document_root),r,
                       a[num_a++].real);
    else
        strcpy(a[num_a++].real,r);
}

void add_redirect(char *f, char *url) {
    if (num_v >= MAX_ALIASES)
      num_v = Saved_num_redirect;
    strcpy(v[num_v].fake,f);
    strcpy(v[num_v++].real,url);
}

char fake[MAX_STRING_LEN + 2],real[MAX_STRING_LEN],dname[HUGE_STRING_LEN];

int translate_name(char *name, FILE *fd) {
    register int x,l;
    char w[MAX_STRING_LEN];
    struct passwd *pw;

    getparents(name);

    for(x=0;x<num_v;x++) {
        l=strlen(v[x].fake);
        if(!strncmp(name,v[x].fake,l)) {
            strsubfirst(l,name,v[x].real);
            return REDIRECT_URL;
        }
    }

    for(x=0; x < num_a; x++) {
        l=strlen(a[x].fake);
        if(!strncmp(name,a[x].fake,l)) {
            strsubfirst(l,name,a[x].real);
            dirs_in_alias = count_dirs(a[x].real);
            return(a[x].script);
        }
    }

    if((user_dir[0]) && (name[0] == '/') && (name[1] == '~')) {
        strcpy(dname,&name[2]);
        getword(w,dname,'/');
        if(!(pw=getpwnam(w)))
            die(NOT_FOUND,name,fd);
        fake[0] = '/';
        fake[1] = '~';
        strcpy(&fake[2],w);
        make_full_path(pw->pw_dir,user_dir,real);
        add_alias(fake,real,STD_DOCUMENT);
        strsubfirst(strlen(w) + 2,name,real);
        return STD_DOCUMENT;
    }

#ifdef HESIOD
    if(!exists(document_root, name))
      if(use_hesiod)
	hes_resolve_filsys(name);
#endif /* HESIOD */
    /* no alias, add document root */
    strsubfirst(0,name,document_root);

    return STD_DOCUMENT;
}

void unmunge_name(char *name) {
    register int x,l;

    l=strlen(document_root);
    if(!strncmp(name,document_root,l)) {
        strsubfirst(l,name,"");
        if(!name[0]) {
            name[0] = '/';
            name[1] = '\0';
        }
        return;
    }
    for(x=0;x < num_a; x++) {
        l=strlen(a[x].real);
        if(!strncmp(name,a[x].real,l)) {
            strsubfirst(l,name,a[x].fake);
            if(!name[0]) {
                name[0] = '/';
                name[1] = '\0';
            }
            return;
        }
    }
}

#ifdef HESIOD

void hes_resolve_filsys(char *path)
{
  char **cpp;
  char *name;
  char *c;

  c = path;
  if(*c == '/')
    ++c;
  
  if(c = index(path, '/'))
     *c++ = '\0';
  else
    return;

  name = path;
  path = c;
  if(!(cpp = hes_resolve(name, "filsys")))
    return;
  
  while(*cpp && strncmp(*cpp, "AFS", 3))
    ++cpp;

  if(!*cpp)
    return;

  c = *cpp+4;
  while(!isspace(*c))
    ++c;
  *c = '\0';
  c = *cpp+4;

  strsubfirst(0, path, c);
  return;
}

#endif /* HESIOD */