htalert.c

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/*	Displaying messages and getting input for Lynx Browser
**	==========================================================
**
**	REPLACE THIS MODULE with a GUI version in a GUI environment!
**
** History:
**	   Jun 92 Created May 1992 By C.T. Barker
**	   Feb 93 Simplified, portablised TBL
**
*/

#include "HTUtils.h"
#include "tcp.h"
#include "HTAlert.h"
#include "LYGlobalDefs.h"
#include "LYCurses.h"
#include "LYStrings.h"
#include "LYUtils.h"
#include "LYSignal.h"
#include "GridText.h"
#include "LYCookie.h"

#include "LYLeaks.h"

#define FREE(x) if (x) {free(x); x = NULL;}


/*	Issue a message about a problem.		HTAlert()
**	--------------------------------
*/
PUBLIC void HTAlert ARGS1(
	CONST char *,	Msg)
{
    if (TRACE) {
        fprintf(stderr, "\nAlert!: %s", Msg);
	fflush(stderr);
        _user_message("Alert!: %s", Msg);
        fprintf(stderr, "\n\n");
	fflush(stderr);
    } else
        _user_message("Alert!: %s", Msg);

    sleep(AlertSecs);
}

/*	Issue a progress message.			HTProgress()
**	-------------------------
*/
PUBLIC void HTProgress ARGS1(
	CONST char *,	Msg)
{
    if (TRACE)
        fprintf(stderr, "%s\n", Msg);
    else
        statusline(Msg);
}

PRIVATE BOOL conf_cancelled = NO; /* used by HTConfirm only - kw */

PUBLIC BOOL HTLastConfirmCancelled NOARGS
{
    if (conf_cancelled) {
	conf_cancelled = NO;	/* reset */
	return(YES);
    } else {
	return(NO);
    }
}

/*	Seek confirmation.				HTConfirm()
**	------------------
*/
PUBLIC BOOL HTConfirm ARGS1(CONST char *, Msg)
{
    conf_cancelled = NO;
    if (dump_output_immediately) { /* Non-interactive, can't respond */
	return(NO);
    } else {
	int c;
#ifdef VMS
	extern BOOLEAN HadVMSInterrupt;
#endif /* VMS */
	
	_user_message("%s (y/n) ", Msg);
	
	while (1) {
	    c = LYgetch();
#ifdef VMS
	    if (HadVMSInterrupt) {
		HadVMSInterrupt = FALSE;
		c = 'N';
	    }
#endif /* VMS */
	    if (TOUPPER(c) == 'Y')
		return(YES);
	    if (c == 7 || c == 3) /* remember we had ^G or ^C */
		conf_cancelled = YES;
	    if (TOUPPER(c) == 'N' || c == 7 || c == 3) /* ^G or ^C cancels */
		return(NO);
	}
    }
}

/*	Prompt for answer and get text back.		HTPrompt()
**	------------------------------------
*/
PUBLIC char * HTPrompt ARGS2(
	CONST char *,	Msg,
	CONST char *,	deflt)
{
    char * rep = NULL;
    char Tmp[200];

    Tmp[0] = '\0';
    Tmp[199] = '\0';

    _statusline(Msg);
    if (deflt) 
        strncpy(Tmp, deflt, 199);

    if (!dump_output_immediately)
        LYgetstr(Tmp, VISIBLE, sizeof(Tmp), NORECALL);

    StrAllocCopy(rep, Tmp);

    return rep;
}

/*
**	Prompt for password without echoing the reply.	HTPromptPassword()
**	----------------------------------------------
*/
PUBLIC char * HTPromptPassword ARGS1(
	CONST char *,	Msg)
{
    char *result = NULL;
    char pw[120];

    pw[0] = '\0';

    if (!dump_output_immediately) {
        _statusline(Msg ? Msg : PASSWORD_PROMPT);
        LYgetstr(pw, HIDDEN, sizeof(pw), NORECALL); /* hidden */
        StrAllocCopy(result, pw);
    } else {
        printf("\n%s\n", PASSWORD_REQUIRED);
	StrAllocCopy(result, "");
    }
    return result;
}

/*     	Prompt both username and password.       HTPromptUsernameAndPassword()
**      ----------------------------------
**
**  On entry,
**      Msg             is the prompting message.
**      *username and
**      *password       are char pointers which contain default
**			or zero-length strings; they are changed
**                      to point to result strings.
**	IsProxy		should be TRUE if this is for
**			proxy authentication.
**
**                      If *username is not NULL, it is taken
**                      to point to a default value.
**                      Initial value of *password is
**                      completely discarded.
**
**  On exit,
**      *username and *password point to newly allocated
**      strings -- original strings pointed to by them
**      are NOT freed.
**
*/
PUBLIC void HTPromptUsernameAndPassword ARGS4(
	CONST char *,	Msg,
	char **,	username,
	char **,	password,
	BOOL,		IsProxy)
{
    if ((IsProxy == FALSE &&
	 authentication_info[0] && authentication_info[1]) ||
	(IsProxy == TRUE &&
	 proxyauth_info[0] && proxyauth_info[1])) {
	/* 
	**  The -auth or -pauth parameter gave us both the username
	**  and password to use for the first realm or proxy server,
	**  respectively, so just use them without any prompting. - FM
	*/
 	StrAllocCopy(*username, (IsProxy ?
		       proxyauth_info[0] : authentication_info[0]));
	if (IsProxy) {
	    FREE(proxyauth_info[0]);
	} else {
	    FREE(authentication_info[0]);
	}
	StrAllocCopy(*password, (IsProxy ?
		       proxyauth_info[1] : authentication_info[1]));
	if (IsProxy) {
	    FREE(proxyauth_info[1]);
	} else {
	    FREE(authentication_info[1]);
	}
    } else if (dump_output_immediately) {
        /*
	 *  We are not interactive and don't have both the
	 *  username and password from the command line,
	 *  but might have one or the other. - FM
	 */
        if ((IsProxy == FALSE && authentication_info[0]) ||
	    (IsProxy == TRUE && proxyauth_info[0])) {
	    /*
	    **  Use the command line username. - FM
	    */
	    StrAllocCopy(*username, (IsProxy ?
			   proxyauth_info[0] : authentication_info[0]));
	    if (IsProxy) {
		FREE(proxyauth_info[0]);
	    } else {
		FREE(authentication_info[0]);
	    }
	} else {
	    /*
	    **  Default to "WWWuser". - FM
	    */
            StrAllocCopy(*username, "WWWuser");
	}
        if ((IsProxy == FALSE && authentication_info[1]) ||
	    (IsProxy == TRUE && proxyauth_info[1])) {
	    /*
	    **  Use the command line password. - FM
	    */
	    StrAllocCopy(*password, (IsProxy ?
			   proxyauth_info[1] : authentication_info[1]));
	    if (IsProxy) {
		FREE(proxyauth_info[1]);
	    } else {
		FREE(authentication_info[1]);
	    }
	} else {
	    /*
	    **  Default to a zero-length string. - FM
	    */
	    StrAllocCopy(*password, "");
	}
	printf("\n%s\n", USERNAME_PASSWORD_REQUIRED);

    } else {
        /*
	 *  We are interactive and don't have both the
	 *  username and password from the command line,
	 *  but might have one or the other. - FM
	 */
        if ((IsProxy == FALSE && authentication_info[0]) ||
	    (IsProxy == TRUE && proxyauth_info[0])) {
	    /*
	    **  Offer the command line username in the
	    **  prompt for the first realm. - FM
	    */
	    StrAllocCopy(*username, (IsProxy ?
			   proxyauth_info[0] : authentication_info[0]));
	    if (IsProxy) {
		FREE(proxyauth_info[0]);
	    } else {
		FREE(authentication_info[0]);
	    }
	}
	/*
	 *  Prompt for confirmation or entry of the username. - FM
	 */
	if (Msg != NULL) {
	    *username = HTPrompt(Msg, *username);
	} else {
	    *username = HTPrompt(USERNAME_PROMPT, *username);
	}
        if ((IsProxy == FALSE && authentication_info[1]) ||
	    (IsProxy == TRUE && proxyauth_info[1])) {
	    /*
	    **  Use the command line password for the first realm. - FM
	    */
	    StrAllocCopy(*password, (IsProxy ?
			   proxyauth_info[1] : authentication_info[1]));
	    if (IsProxy) {
		FREE(proxyauth_info[1]);
	    } else {
		FREE(authentication_info[1]);
	    }
	} else if (*username != NULL && *username[0] != '\0') {
	    /*
	    **  We have a non-zero length username,
	    **  so prompt for the password. - FM
	    */
	    *password = HTPromptPassword(PASSWORD_PROMPT);
	} else {
	    /*
	    **  Return a zero-length password. - FM
	    */
	    StrAllocCopy(*password, "");
	}
    }
}

/*	Confirm a cookie operation.			HTConfirmCookie()
**	---------------------------
**
**  On entry,
**	server			is the server sending the Set-Cookie.
**	domain			is the domain of the cookie.
**	path			is the path of the cookie.
**	name			is the name of the cookie.
**	value			is the value of the cookie.
**
**  On exit,
**	Returns FALSE on cancel,
**		TRUE if the cookie should be set.
*/
PUBLIC BOOL HTConfirmCookie ARGS6(
	void *,		dp,
	CONST char *,	server,
	CONST char *,	domain,
	CONST char *,	path,
	CONST char *,	name,
	CONST char *,	value)
{
    char message[256];
    domain_entry *de;
    int ch, namelen, valuelen, space_free;

#ifdef VMS
    extern BOOLEAN HadVMSInterrupt;
#endif /* VMS */

    if ((de = (domain_entry *)dp) == NULL)
        return FALSE;
  
    /*
    **  If the user has specified a constant action, don't prompt at all.
    */
    if (de->bv == ACCEPT_ALWAYS)
        return TRUE;
    if (de->bv == REJECT_ALWAYS)
        return FALSE;

    if (dump_output_immediately) {
        /*
	**  Non-interactive, can't respond.  Use the LYSetCookies value
	*   based on its compilation or configuration setting, or on the
	**  command line toggle. - FM
	*/
        return LYSetCookies;
    }

    /*
    **  Figure out how much of the cookie we can show.
    **  The '37' is the length of ADVANCED_COOKIE_CONFIRMATION,
    **  minus the length of the %s directives (10 chars)
    */
    if (de != NULL) {
        if (de->bv == ACCEPT_ALWAYS) 
	    return TRUE;
	if (de->bv == REJECT_ALWAYS) 
	    return FALSE;
    }
    space_free = (((LYcols - 1) - 37) - strlen(server));
    if (space_free < 0)
        space_free = 0;
    namelen = strlen(name);
    valuelen = strlen(value);
    if ((namelen + valuelen) > space_free) {
        /*
	**  Argh... there isn't enough space on our single line for
	**  the whole cookie.  Reduce them both by a percentage.
	**  This should be smarter.
	*/
        float percentage;
        percentage = (float)space_free/(float)(namelen + valuelen);
        namelen = (int)(percentage*(float)namelen);
        valuelen = (int)(percentage*(float)valuelen);
    }
    sprintf(message, ADVANCED_COOKIE_CONFIRMATION,
    	    server, namelen, name, valuelen, value);
    _statusline(message);
    while (1) {
	ch = LYgetch();
#ifdef VMS
	if (HadVMSInterrupt) {
	    HadVMSInterrupt = FALSE;
	    ch = 'N';
	}
#endif /* VMS */
	switch(TOUPPER(ch)) {
	    case 'A':
	        /*
		**  Set to accept all cookies for this domain.
		*/
		de->bv = ACCEPT_ALWAYS;
		_user_message(ALWAYS_ALLOWING_COOKIES, de->domain);
		sleep(MessageSecs);
		return TRUE;

	    case 'N':
	    case 7:	/* Ctrl-G */
	    case 3:	/* Ctrl-C */
	        /*
		**  Reject the cookie.
		*/
		_statusline(REJECTING_COOKIE);
		sleep(MessageSecs);
		return FALSE;

    	    case 'V':
	        /*
		**  Set to reject all cookies from this domain.
		*/
		de->bv = REJECT_ALWAYS;
		_user_message(NEVER_ALLOWING_COOKIES, de->domain);
		sleep(MessageSecs);
		return FALSE;

	    case 'Y':
	        /*
		**  Accept the cookie.
		*/
		_statusline(ALLOWING_COOKIE);
		sleep(InfoSecs);
		return TRUE;

	    default:
	        continue;
	}
    }
}

/*      Confirm redirection of POST.		HTConfirmPostRedirect()
**	----------------------------
**
**  On entry,
**      Redirecting_url             is the Location.
**	server_status		    is the server status code.
**
**  On exit,
**      Returns 0 on cancel,
**	  1 for redirect of POST with content,
**	303 for redirect as GET without content
*/
PUBLIC int HTConfirmPostRedirect ARGS2(
	CONST char *,	Redirecting_url,
	int,		server_status)
{
    char *show_POST_url = NULL;
    char StatusInfo[256];
    char url[256];
    int on_screen = 0;	/* 0 - show menu
   			 * 1 - show url
			 * 2 - menu is already on screen */

    if (server_status == 303 ||
        server_status == 302) {
	/*
	 *  HTTP.c should not have called us for either of
	 *  these because we're treating 302 as historical,
	 *  so just return 303. - FM
	 */
	return 303;
    }

    if (dump_output_immediately)
        if (server_status == 301) {
	    /*
	    **  Treat 301 as historical, i.e., like 303 (GET
	    **  without content), when not interactive. - FM
	    */
            return 303;
        } else {
	    /*
	    **  Treat anything else (e.g., 305, 306 or 307) as too
	    **  dangerous to redirect without confirmation, and thus
	    **  cancel when not interactive. - FM
	    */
	    return 0;
	}

    StatusInfo[254] = StatusInfo[255] = '\0';
    url[254] = url[(LYcols < 250 ? LYcols-1 : 255)] = '\0';
    if (user_mode == NOVICE_MODE) {
        on_screen = 2;
        move(LYlines-2, 0);
        sprintf(StatusInfo, SERVER_ASKED_FOR_REDIRECTION, server_status);
	addstr(StatusInfo);
	clrtoeol();
        move(LYlines-1, 0);
	sprintf(url, "URL: %.*s",
		    (LYcols < 250 ? LYcols-6 : 250), Redirecting_url);
        addstr(url);
	clrtoeol();
	if (server_status == 301) {
	    _statusline(PROCEED_GET_CANCEL);
	} else {
	    _statusline(PROCEED_OR_CANCEL);
	}
    } else {
	sprintf(StatusInfo, "%d %.*s",
			    server_status,
			    251,
			    ((server_status == 301) ?
			 ADVANCED_POST_GET_REDIRECT :
			 ADVANCED_POST_REDIRECT));
	StrAllocCopy(show_POST_url, LOCATION_HEADER);
	StrAllocCat(show_POST_url, Redirecting_url);
    }
    while (1) {
	int c;  

	switch (on_screen) {
	    case 0:
		_statusline(StatusInfo);
		break;
	    case 1:
	        _statusline(show_POST_url);
	}
	c = LYgetch();
	switch (TOUPPER(c)) {
	    case 'P':
		/*
		**  Proceed with 301 or 307 redirect of POST
		**  with same method and POST content. - FM
		*/
	        FREE(show_POST_url);
		return 1;	

 	    case 7:
 	    case 'C':
	        /*
		**  Cancel request.
		*/
	        FREE(show_POST_url);
		return 0;

	    case 'U':
	        /*
		**  Show URL for intermediate or advanced mode.
		*/
	        if (user_mode != NOVICE_MODE) {
		    if (on_screen == 1) {
			on_screen = 0;
		    } else {
			on_screen = 1;
		    }
		}
		break;

	    case 'G':
		if (server_status == 301) {
		    /*
		    **  Treat as 303 (GET without content).
		    */
		    FREE(show_POST_url);
		    return 303;
		}
		/* fall through to default */

	    default:
	        /*
		**  Get another character.
		*/
		if (on_screen == 1) {
		    on_screen = 0;
		} else {
		    on_screen = 2;
		}
	}
    }
}