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blog.c
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blog.c
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/***************************************************
*
* Copyright 2007 by Sean Conner. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Comments, questions and criticisms can be sent to: sean@conman.org
*
****************************************************/
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <locale.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <syslog.h>
#include <lualib.h>
#include <lauxlib.h>
#include "blog.h"
#include "wbtum.h"
/***********************************************************************/
static inline size_t max(size_t a,size_t b)
{
if (a > b)
return a;
else
return b;
}
/***********************************************************************/
static bool set_date(char const *file,struct btm *when,struct btm *now)
{
assert(file != NULL);
assert(when != NULL);
assert(now != NULL);
FILE *fp = fopen(file,"r");
if (fp == NULL)
{
fp = fopen(file,"w");
if (fp != NULL)
{
*when = *now;
fprintf(
fp,
"%4d/%02d/%02d.%d\n",
now->year,
now->month,
now->day,
now->part
);
fclose(fp);
}
else
{
syslog(LOG_ERR,"%s: %s",file,strerror(errno));
return false;
}
}
else
{
char buffer[128];
char *p;
fgets(buffer,sizeof(buffer),fp);
when->year = strtoul(buffer,&p,10); p++;
when->month = strtoul(p,&p,10); p++;
when->day = strtoul(p,&p,10); p++;
when->part = strtoul(p,&p,10);
fclose(fp);
}
return true;
}
/***********************************************************************/
static int blog_lock(char const *lockfile)
{
if (lockfile)
{
int lock = open(lockfile,O_CREAT | O_RDWR,0x666);
if (lock == -1)
{
syslog(LOG_ERR,"%s %s",lockfile,strerror(errno));
return lock;
}
int rc = fcntl(
lock,
F_SETLKW,
&(struct flock){
.l_type = F_WRLCK,
.l_start = 0,
.l_whence = SEEK_SET,
.l_len = 0,
}
);
if (rc < 0)
{
syslog(LOG_ERR,"fcntl('%s',F_SETLKW) = %s",lockfile,strerror(errno));
close(lock);
return -1;
}
return lock;
}
return -1;
}
/***********************************************************************/
static void blog_unlock(char const *lockfile,int lock)
{
assert(lockfile != NULL);
if (lock >= 0)
{
int rc = fcntl(
lock,
F_SETLK,
&(struct flock){
.l_type = F_UNLCK,
.l_start = 0,
.l_whence = SEEK_SET,
.l_len = 0,
}
);
if (rc == 0)
{
close(lock);
remove(lockfile);
}
else
syslog(LOG_ERR,"fcntl('%s',F_UNLCK) = %s",lockfile,strerror(errno));
}
}
/***********************************************************************/
static void date_to_dir(char *tname,struct btm const *date)
{
assert(tname != NULL);
assert(date != NULL);
snprintf(tname,FILENAME_MAX,"%04d/%02d/%02d",date->year,date->month,date->day);
}
/***********************************************************************/
static void date_to_filename(char *tname,struct btm const *date,char const *file)
{
assert(tname != NULL);
assert(date != NULL);
assert(file != NULL);
snprintf(tname,FILENAME_MAX,"%04d/%02d/%02d/%s",date->year,date->month,date->day,file);
}
/**********************************************************************/
static void date_to_part(char *tname,struct btm const *date,int p)
{
assert(tname != NULL);
assert(date != NULL);
assert(p > 0);
snprintf(tname,FILENAME_MAX,"%04d/%02d/%02d/%d",date->year,date->month,date->day,p);
}
/*********************************************************************/
static FILE *open_file_r(char const *name,struct btm const *date)
{
FILE *in;
char buffer[FILENAME_MAX];
assert(name != NULL);
assert(date != NULL);
date_to_filename(buffer,date,name);
in = fopen(buffer,"r");
if (in == NULL)
in = fopen("/dev/null","r");
/*----------------------------------------------------------------------
; because the code was written using a different IO model (that is, if
; there's no data in the file to begin with, we automatically end up in
; EOF mode, let's trigger EOF. Sigh.
;-----------------------------------------------------------------------*/
ungetc(fgetc(in),in);
return in;
}
/**********************************************************************/
static FILE *open_file_w(char const *name,struct btm const *date)
{
FILE *out;
char buffer[FILENAME_MAX];
assert(name != NULL);
assert(date != NULL);
date_to_filename(buffer,date,name);
out = fopen(buffer,"w");
return out;
}
/*********************************************************************/
static bool date_check(struct btm const *date)
{
char tname[FILENAME_MAX];
struct stat status;
assert(date != NULL);
date_to_dir(tname,date);
return stat(tname,&status) == 0;
}
/************************************************************************/
static int date_checkcreate(struct btm const *date)
{
int rc;
char tname[FILENAME_MAX];
struct stat status;
assert(date != NULL);
snprintf(tname,sizeof(tname),"%04d",date->year);
rc = stat(tname,&status);
if (rc != 0)
{
if (errno != ENOENT)
return errno;
rc = mkdir(tname,0777);
if (rc != 0)
return errno;
}
snprintf(tname,sizeof(tname),"%04d/%02d",date->year,date->month);
rc = stat(tname,&status);
if (rc != 0)
{
if (errno != ENOENT)
return errno;
rc = mkdir(tname,0777);
if (rc != 0)
return errno;
}
snprintf(tname,sizeof(tname),"%04d/%02d/%02d",date->year,date->month,date->day);
rc = stat(tname,&status);
if (rc != 0)
{
if (errno != ENOENT)
return errno;
rc = mkdir(tname,0777);
if (rc != 0)
return errno;
}
return 0;
}
/********************************************************************/
static char *blog_meta_entry(char const *name,struct btm const *date)
{
FILE *fp;
char *text;
size_t size;
unsigned int num;
assert(name != NULL);
assert(date != NULL);
text = NULL;
size = 0;
num = date->part;
fp = open_file_r(name,date);
while(!feof(fp) && (num--))
{
ssize_t bytes = getline(&text,&size,fp);
if (bytes == -1)
{
fclose(fp);
free(text);
return strdup("");
}
}
fclose(fp);
if (text)
{
char *nl = strchr(text,'\n');
if (nl) *nl = '\0';
}
else
return strdup("");
return text;
}
/********************************************************************/
static size_t blog_meta_read(
char **plines[],
char const *name,
struct btm const *date
)
{
char **lines;
size_t i;
FILE *fp;
assert(plines != NULL);
assert(name != NULL);
assert(date != NULL);
lines = calloc(100,sizeof(char *));
if (lines == NULL)
{
*plines = NULL;
return 0;
}
fp = open_file_r(name,date);
if (feof(fp))
{
fclose(fp);
*plines = lines;
return 0;
}
for(i = 0 ; i < 100 ; i++)
{
char *nl;
ssize_t bytes;
size_t size;
lines[i] = NULL;
size = 0;
bytes = getline(&lines[i],&size,fp);
if (bytes == -1)
{
free(lines[i]);
break;
}
nl = strchr(lines[i],'\n');
if (nl) *nl = '\0';
}
fclose(fp);
*plines = lines;
return i;
}
/************************************************************************/
static void blog_meta_adjust(char **plines[],size_t num,size_t maxnum)
{
assert(plines != NULL);
assert(*plines != NULL);
assert(num <= maxnum);
assert(num <= 100);
assert(maxnum <= 100);
char **lines = *plines;
while(num < maxnum)
{
assert(lines[num] == NULL);
lines[num++] = strdup("");
}
}
/************************************************************************/
static int blog_meta_write(
char const *name,
struct btm const *date,
char *list[],
size_t num
)
{
assert(name != NULL);
assert(date != NULL);
assert(list != NULL);
FILE *fp = open_file_w(name,date);
if (fp == NULL)
return errno;
for (size_t i = 0 ; i < num ; i++)
fprintf(fp,"%s\n",list[i]);
fclose(fp);
return 0;
}
/************************************************************************/
#if LUA_VERSION_NUM == 501
# define LUA_OK 0
# define lua_rawlen(L,idx) lua_objlen((L),(idx))
int lua_absindex(lua_State *L,int idx)
{
return (idx > 0) || (idx <= LUA_REGISTRYINDEX)
? idx
: lua_gettop(L) + idx + 1
;
}
#endif
/***************************************************************************/
static char const *confL_checklstring(lua_State *L,int idx,size_t *ps,char const *table,char const *field)
{
assert(L != NULL);
assert(idx != 0);
assert(table != NULL);
assert(field != NULL);
char const *s = lua_tolstring(L,idx,ps);
if (s == NULL)
luaL_error(L,"table '%s' missing mandatory field '%s'",table,field);
return s;
}
/***************************************************************************/
static char const *confL_checkstring(lua_State *L,int idx,char const *table,char const *field)
{
assert(L != NULL);
assert(idx != 0);
assert(table != NULL);
assert(field != NULL);
return confL_checklstring(L,idx,NULL,table,field);
}
/***************************************************************************/
static void confL_tofields(lua_State *L,int idx,struct fields *fields)
{
assert(L != NULL);
assert(idx != 0);
assert(fields != NULL);
idx = lua_absindex(L,idx);
if (lua_isnil(L,idx))
{
fields->uid = 0;
fields->name = 0;
fields->email = 0;
}
else
{
lua_getfield(L,idx,"uid");
fields->uid = luaL_optinteger(L,-1,1) - 1;
lua_getfield(L,idx,"name");
fields->name = luaL_optinteger(L,-1,3) - 1;
lua_getfield(L,idx,"email");
fields->email = luaL_optinteger(L,-1,4) - 1;
lua_pop(L,3);
}
}
/***************************************************************************/
static void confL_toauthor(lua_State *L,int idx,struct author *auth)
{
assert(L != NULL);
assert(idx != 0);
assert(auth != NULL);
idx = lua_absindex(L,idx);
if (lua_isnil(L,idx))
{
auth->name = "Joe Blog";
auth->email = "joe@example.com";
auth->file = NULL;
auth->fields.uid = 0;
auth->fields.name = 0;
}
else
{
lua_getfield(L,idx,"name");
auth->name = luaL_optstring(L,-1,"Joe Blog");
lua_getfield(L,idx,"email");
auth->email = luaL_optstring(L,-1,"joe@example.com");
lua_getfield(L,idx,"file");
auth->file = luaL_optstring(L,-1,NULL);
lua_getfield(L,idx,"fields");
confL_tofields(L,-1,&auth->fields);
lua_pop(L,4);
}
}
/***************************************************************************/
static void confL_toemail(lua_State *L,int idx,struct bemail *email)
{
assert(L != NULL);
assert(idx != 0);
assert(email != NULL);
idx = lua_absindex(L,idx);
if (lua_isnil(L,idx))
{
email->list = NULL;
email->message = NULL;
email->subject = NULL;
email->notify = false;
}
else
{
lua_getfield(L,idx,"list");
email->list = confL_checkstring(L,-1,"email","list");
lua_getfield(L,idx,"message");
email->message = confL_checkstring(L,-1,"email","message");
lua_getfield(L,idx,"subject");
email->subject = confL_checkstring(L,-1,"email","subject");
email->notify = true;
lua_pop(L,3);
}
}
/***************************************************************************/
static void confL_toitems(lua_State *L,int idx,template__t *temp)
{
assert(L != NULL);
assert(idx != 0);
assert(temp != NULL);
if (lua_isnumber(L,idx))
{
temp->items = lua_tointeger(L,-1);
temp->pagegen = "items";
}
else if (lua_isstring(L,idx))
{
char const *x = lua_tostring(L,-1);
char *p;
temp->items = strtoul(x,&p,10);
switch(*p)
{
case 'd': break;
case 'w': temp->items *= 7; break;
case 'm': temp->items *= 30; break;
default: break;
}
temp->pagegen = "days";
}
else if (lua_isnil(L,-1))
{
temp->items = 15;
temp->pagegen = "items";
}
else
luaL_error(L,"wrong type for items");
}
/***************************************************************************/
static size_t confL_totemplates(lua_State *L,int idx,template__t *ptemps[])
{
size_t max;
template__t *temps;
assert(L != NULL);
assert(idx != 0);
assert(ptemps != NULL);
idx = lua_absindex(L,idx);
if (lua_isnil(L,idx))
return luaL_error(L,"missing template secton");
max = lua_rawlen(L,idx);
if (max == 0)
return luaL_error(L,"at least one template file is required");
temps = lua_newuserdata(L,max * sizeof(template__t));
lua_pushvalue(L,-1);
luaL_ref(L,LUA_REGISTRYINDEX); /* prevent GC reclaiming this memory */
for (size_t i = 0 ; i < max ; i++)
{
int tidx;
lua_pushinteger(L,i + 1);
lua_gettable(L,idx);
tidx = lua_gettop(L);
lua_getfield(L,tidx,"template");
temps[i].template = confL_checkstring(L,-1,"template","template");
lua_getfield(L,tidx,"output");
temps[i].file = confL_checkstring(L,-1,"template","output");
lua_getfield(L,tidx,"items");
confL_toitems(L,-1,&temps[i]);
lua_getfield(L,tidx,"reverse");
temps[i].reverse = lua_toboolean(L,-1);
lua_getfield(L,tidx,"fullurl");
temps[i].fullurl = lua_toboolean(L,-1);
lua_getfield(L,tidx,"posthook");
temps[i].posthook = luaL_optstring(L,-1,NULL);
lua_pop(L,7);
}
*ptemps = temps;
return max;
}
/***************************************************************************/
static size_t confL_toaffiliates(lua_State *L,int idx,aflink__t *paffs[])
{
size_t max;
aflink__t *affs;
assert(L != NULL);
assert(idx != 0);
assert(paffs != NULL);
idx = lua_absindex(L,idx);
if (lua_isnil(L,idx))
{
*paffs = NULL;
return 0;
}
max = lua_rawlen(L,idx);
if (max == 0)
{
*paffs = NULL;
return 0;
}
affs = lua_newuserdata(L,max * sizeof(aflink__t));
lua_pushvalue(L,-1);
luaL_ref(L,LUA_REGISTRYINDEX); /* prevent GC reclaiming this memory */
for (size_t i = 0 ; i < max ; i++)
{
int tidx;
lua_pushinteger(L,i + 1);
lua_gettable(L,idx);
tidx = lua_gettop(L);
lua_getfield(L,tidx,"proto");
affs[i].proto = confL_checklstring(L,-1,&affs[i].psize,"affiliate","proto");
lua_getfield(L,tidx,"link");
affs[i].format = confL_checkstring(L,-1,"affiliate","link");
lua_pop(L,3);
}
*paffs = affs;
return max;
}
/***************************************************************************/
static int confL_config(lua_State *L)
{
size_t urllen;
assert(L != NULL);
struct config *config = lua_touserdata(L,1);
lua_getglobal(L,"name");
config->name = luaL_optstring(L,-1,"A Blog Grows in Cyberspace");
lua_getglobal(L,"description");
config->description = luaL_optstring(L,-1,"A place where I talk about stuff in cyberspace");
lua_getglobal(L,"class");
config->class = luaL_optstring(L,-1,"blog, rants, random stuff, programming");
lua_getglobal(L,"basedir");
config->basedir = luaL_optstring(L,-1,".");
lua_getglobal(L,"webdir");
config->webdir = luaL_optstring(L,-1,"htdocs");
lua_getglobal(L,"lockfile");
config->lockfile = luaL_optstring(L,-1,".mod_blog.lock");
lua_getglobal(L,"url");
config->url = luaL_optlstring(L,-1,"http://www.example.com/blog/",&urllen);
lua_getglobal(L,"adtag");
config->adtag = luaL_optstring(L,-1,"programming");
lua_getglobal(L,"conversion");
config->conversion = luaL_optstring(L,-1,"html");
lua_getglobal(L,"prehook");
config->prehook = luaL_optstring(L,-1,NULL);
lua_getglobal(L,"posthook");
config->posthook = luaL_optstring(L,-1,NULL);
lua_getglobal(L,"author");
confL_toauthor(L,-1,&config->author);
lua_getglobal(L,"email");
confL_toemail(L,-1,&config->email);
lua_getglobal(L,"templates");
config->templatenum = confL_totemplates(L,-1,&config->templates);
lua_getglobal(L,"affiliate");
config->affiliatenum = confL_toaffiliates(L,-1,&config->affiliates);
/*--------------------------------------
; ensure that the URL ends with a '/'.
;---------------------------------------*/
if (config->url[urllen-1] != '/')
{
lua_pushlstring(L,config->url,urllen);
lua_pushliteral(L,"/");
lua_concat(L,2);
config->url = lua_tostring(L,-1);
}
/*---------------------------------------------------
; XXX - need to think about a messed up URL here ...
;----------------------------------------------------*/
char const *s = strchr(config->url,'/'); /* first slash in authority section */
s = strchr(++s,'/'); /* second slash in authority section */
s = strchr(++s,'/'); /* start of path component */
config->baseurl = s;
return 0;
}
/***************************************************************************/
static bool config_read(char const *conf,Blog *blog)
{
int rc;
assert(blog != NULL);
if (conf == NULL)
{
conf = getenv("REDIRECT_BLOG_CONFIG");
if (conf == NULL)
{
conf = getenv("BLOG_CONFIG");
if (conf == NULL)
{
syslog(LOG_ERR,"env BLOG_CONFIG not defined");
return NULL;
}
}
}
blog->config.L = luaL_newstate();
if (blog->config.L == NULL)
{
syslog(LOG_ERR,"cannot create Lua state");
return false;
}
luaL_openlibs(blog->config.L);
rc = luaL_loadfile(blog->config.L,conf);
if (rc != LUA_OK)
{
syslog(LOG_ERR,"Lua error: (%d) %s",rc,lua_tostring(blog->config.L,-1));
return false;
}
rc = lua_pcall(blog->config.L,0,0,0);
if (rc != LUA_OK)
{
syslog(LOG_ERR,"Lua error: (%d) %s",rc,lua_tostring(blog->config.L,-1));
return false;
}
/*------------------------------------------------------------------------
; Ensure that searches are using the C locale, because we give the config
; file the full access to Lua, including os.setlocale().
;-------------------------------------------------------------------------*/
setlocale(LC_COLLATE,"C");
/*-----------------------------------------------------------------------
; Some items aren't optional, so let Lua do the error checking for us and
; return an error, which is caught here; otherwise, things might blow up.
; Besides, catching common configuration errors is always a good thing.
;------------------------------------------------------------------------*/
lua_pushcfunction(blog->config.L,confL_config);
lua_pushlightuserdata(blog->config.L,&blog->config);
rc = lua_pcall(blog->config.L,1,0,0);
if (rc != LUA_OK)
{
syslog(LOG_ERR,"Lua error: (%d) %s",rc,lua_tostring(blog->config.L,-1));
return false;
}
return true;
}
/***************************************************************************/
Blog *BlogNew(char const *configfile)
{
struct tm *ptm;
Blog *blog = calloc(1,sizeof(struct blog));
if (blog == NULL)
{
syslog(LOG_ERR,"Can't allocate blog memory");
return NULL;
}
if (!config_read(configfile,blog))
{
BlogFree(blog);
return NULL;
}
umask(022);
if (chdir(blog->config.basedir) != 0)
{
syslog(LOG_ERR,"%s: %s",blog->config.basedir,strerror(errno));
BlogFree(blog);
return NULL;
}
blog->tnow = time(NULL);
ptm = localtime(&blog->tnow);
blog->now.year = ptm->tm_year + 1900;
blog->now.month = ptm->tm_mon + 1;
blog->now.day = ptm->tm_mday;
blog->now.part = 1;
if (!set_date(".first",&blog->first,&blog->now) || !set_date(".last",&blog->last,&blog->now))
{
BlogFree(blog);
return NULL;
}
if (
(blog->last.year == blog->now.year)
&& (blog->last.month == blog->now.month)
&& (blog->last.day == blog->now.day)
)
{
blog->now.part = blog->last.part;
}
return blog;
}
/***********************************************************************/
void BlogFree(Blog *blog)
{
assert(blog != NULL);
if (blog->config.L != NULL)
lua_close(blog->config.L);
free(blog);
}
/************************************************************************/
BlogEntry *BlogEntryNew(Blog *blog)
{
assert(blog != NULL);
BlogEntry *pbe = malloc(sizeof(struct blogentry));
if (pbe != NULL)
{
pbe->node.ln_Succ = NULL;
pbe->node.ln_Pred = NULL;
pbe->blog = blog;
pbe->valid = true;
pbe->timestamp = time(NULL);
pbe->when.year = blog->now.year;
pbe->when.month = blog->now.month;
pbe->when.day = blog->now.day;
pbe->when.part = 0;
pbe->title = NULL;
pbe->class = NULL;
pbe->author = NULL;
pbe->status = NULL;
pbe->adtag = NULL;
pbe->body = NULL;
}
return pbe;
}
/***********************************************************************/
BlogEntry *BlogEntryRead(Blog const *blog,struct btm const *which)
{
BlogEntry *entry;
char pname[FILENAME_MAX];
FILE *sinbody;
struct stat status;
assert(blog != NULL);
assert(which != NULL);
assert(which->part > 0);
assert(btm_cmp_date(which,&blog->first) >= 0);
if (!date_check(which))
return NULL;
date_to_part(pname,which,which->part);
if (access(pname,R_OK) != 0)
return NULL;
entry = malloc(sizeof(struct blogentry));
if (entry == NULL)
return NULL;
entry->node.ln_Succ = NULL;
entry->node.ln_Pred = NULL;
entry->valid = true;
entry->blog = blog;
entry->when.year = which->year;
entry->when.month = which->month;
entry->when.day = which->day;
entry->when.part = which->part;
entry->title = blog_meta_entry("titles",which);
entry->class = blog_meta_entry("class",which);
entry->author = blog_meta_entry("authors",which);
entry->status = blog_meta_entry("status",which);
entry->adtag = blog_meta_entry("adtag",which);
date_to_part(pname,which,which->part);
if (stat(pname,&status) == 0)
entry->timestamp = status.st_mtime;
else
entry->timestamp = blog->tnow;
sinbody = fopen(pname,"r");
if (sinbody == NULL)
entry->body = strdup("");
else
{
entry->body = malloc(status.st_size + 1);
fread(entry->body,1,status.st_size,sinbody);
fclose(sinbody);
entry->body[status.st_size] = '\0';
}
return entry;
}
/**********************************************************************/
void BlogEntryReadBetweenU(
Blog const *blog,
List *list,
struct btm const *restrict start,
struct btm const *restrict end
)
{
BlogEntry *entry;
struct btm current;
assert(blog != NULL);
assert(list != NULL);
assert(start != NULL);
assert(end != NULL);
current = *start;
while(btm_cmp(¤t,end) <= 0)
{
entry = BlogEntryRead(blog,¤t);