This website has closed for the day, please check our office hours below
Current Server Time is: "); +const ngx_str_t FOOT_HTML = ngx_string("
"); +const char * DAY_NAMES[7] = { + "Monday", + "Tuesday", + "Wednesday", + "Thursday", + "Friday", + "Saturday", + "Sunday" +}; /* Main Configuration Structure */ @@ -43,8 +56,9 @@ static ngx_int_t ngx_http_office_hours_init(ngx_conf_t * cf); static char *ngx_http_office_hours(ngx_conf_t * cf, ngx_command_t * cmd, void *conf); -/* Body Filter Storage */ +/* Filter Storage */ +static ngx_http_output_header_filter_pt ngx_http_next_header_filter; static ngx_http_output_body_filter_pt ngx_http_next_body_filter; /* Utility Functions */ @@ -53,6 +67,15 @@ static ngx_uint_t * parse_office_hours_string(ngx_str_t office_hours); static ngx_flag_t within_office_hours(ngx_uint_t ** office_hours); static ngx_uint_t get_day_of_week(time_t time); static ngx_uint_t get_seconds_of_day(time_t time); +static ngx_uint_t parse_number(ngx_str_t string, ngx_uint_t start, ngx_uint_t end); +static ngx_str_t create_output_html(ngx_http_office_hours_conf_t * conf); +static char * format_hours(ngx_uint_t * seconds, char * day); +static char * format_seconds(ngx_uint_t seconds); +static char * left_pad(unsigned int number); + +/* Globals */ +ngx_regex_compile_t rc; +ngx_str_t OUTPUT_HTML; /* * Module Definitions @@ -109,17 +132,64 @@ ngx_module_t ngx_http_office_hours_filter_module = { }; +/* + * Main Header Filter + * If the current time is within office hours, it goes to the next + * handler. Otherwise it sets the headers to 403 + */ + +static ngx_int_t +ngx_http_office_hours_header_filter(ngx_http_request_t * r) +{ + + ngx_uint_t ** parsed_office_hours; + ngx_http_office_hours_conf_t *conf; + + conf = + ngx_http_get_module_loc_conf(r, + ngx_http_office_hours_filter_module); + + + if (conf->office_hours == NULL) { + ngx_log_error(NGX_LOG_DEBUG, r->connection->log, 0, + "Office hours disabled"); + return ngx_http_next_header_filter(r); + } + + parsed_office_hours = parse_office_hours(conf->office_hours); + + if (within_office_hours(parsed_office_hours)) { + ngx_log_error(NGX_LOG_DEBUG, r->connection->log, 0, + "Within office hours"); + return ngx_http_next_header_filter(r); + } + + ngx_log_error(NGX_LOG_DEBUG, r->connection->log, 0, + "Outside office hours"); + + if (OUTPUT_HTML.data == NULL) { + OUTPUT_HTML = create_output_html(conf); + } + + r->headers_out.status = NGX_HTTP_FORBIDDEN; + r->headers_out.content_length_n = OUTPUT_HTML.len; + + return ngx_http_next_header_filter(r); +} + /* * Main Body Filter * If the current time is within office hours, it goes to the next - * handler. Otherwise it returns 403 and the office hour listing. + * handler. Otherwise it replaces the body with the office hours. */ static ngx_int_t -ngx_http_office_hours_body_filter(ngx_http_request_t * r, ngx_chain_t * in) +ngx_http_office_hours_body_filter(ngx_http_request_t * r, ngx_chain_t *in) { + ngx_buf_t *b; ngx_uint_t ** parsed_office_hours; + ngx_chain_t out; ngx_http_office_hours_conf_t *conf; conf = @@ -144,8 +214,28 @@ ngx_http_office_hours_body_filter(ngx_http_request_t * r, ngx_chain_t * in) ngx_log_error(NGX_LOG_DEBUG, r->connection->log, 0, "Outside office hours"); - r->keepalive = 0; - return NGX_HTTP_FORBIDDEN; + if (OUTPUT_HTML.data == NULL) { + OUTPUT_HTML = create_output_html(conf); + } + + b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); + if (b == NULL) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "Failed to allocate response buffer."); + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + out.buf = b; + out.next = NULL; + + b->start = OUTPUT_HTML.data; + b->pos = b->start; + b->end = OUTPUT_HTML.data + OUTPUT_HTML.len; + b->last = b->end; + + b->memory = 1; + b->last_buf = 1; + + return ngx_http_next_body_filter(r, &out); } /* @@ -231,20 +321,6 @@ static char *ngx_http_office_hours_merge_conf(ngx_conf_t * cf, return NGX_CONF_OK; } -/* - * Postconfig Initialization Handler - * Sets the request filter at the top of the chain - */ - -static ngx_int_t ngx_http_office_hours_init(ngx_conf_t * cf) -{ - - ngx_http_next_body_filter = ngx_http_top_body_filter; - ngx_http_top_body_filter = ngx_http_office_hours_body_filter; - - return NGX_OK; -} - /* * Parse the office hour strings in the configuration file * to fill out the hours array (in seconds) @@ -289,6 +365,8 @@ static ngx_uint_t ** parse_office_hours(ngx_array_t * office_hours) static ngx_uint_t * parse_office_hours_string(ngx_str_t office_hours) { + int captures[(1 + 4) * 3]; + ngx_int_t n; ngx_uint_t * parsed_hours; parsed_hours = malloc(2 * sizeof(ngx_uint_t)); @@ -299,6 +377,22 @@ static ngx_uint_t * parse_office_hours_string(ngx_str_t office_hours) return parsed_hours; } + n = ngx_regex_exec(rc.regex, &office_hours, captures, (1 + 4) * 3); + + if (n >= 0) { + /* Opening Hours */ + + parsed_hours[0] = 60 * 60 * parse_number(office_hours, captures[2], captures[3]); + parsed_hours[0] = parsed_hours[0] + 60 * parse_number(office_hours, captures[4], captures[5]); + + parsed_hours[1] = 60 * 60 * parse_number(office_hours, captures[6], captures[7]); + parsed_hours[1] = parsed_hours[1] + 60 * parse_number(office_hours, captures[8], captures[9]); + + return parsed_hours; + } + + /* Non-matching strings count as open */ + parsed_hours[0] = 0; parsed_hours[1] = 86400; return parsed_hours; @@ -328,6 +422,7 @@ static ngx_flag_t within_office_hours(ngx_uint_t ** office_hours) /* * Calculate the day of the week given a timestamp */ + static ngx_uint_t get_day_of_week(time_t time) { @@ -338,8 +433,155 @@ static ngx_uint_t get_day_of_week(time_t time) /* * Calculate the number of seconds elapsed today */ + static ngx_uint_t get_seconds_of_day(time_t time) { return time - (time / 86400) * 86400; } + +/* + * Parses a string, returns 0 if match was not found + */ + +static ngx_uint_t parse_number(ngx_str_t string, ngx_uint_t start, ngx_uint_t end) +{ + + if (end - start == 0) { + return 0; + } + + return ngx_atoi(&string.data[start], end - start); +} + +/* + * Given the current office hours configuration it creates the custom + * HTML + */ + +static ngx_str_t create_output_html(ngx_http_office_hours_conf_t * conf) +{ + + char * output_buffer; + time_t now; + ngx_str_t output_html; + ngx_uint_t i, seconds_of_day; + ngx_uint_t ** parsed_office_hours; + + + output_buffer = malloc(1024 * sizeof(char)); + parsed_office_hours = parse_office_hours(conf->office_hours); + now = ngx_time(); + seconds_of_day = get_seconds_of_day(now); + + sprintf(output_buffer, "%s", (char *) HEAD_HTML.data); + + for (i = 0; i < 7; ++i) { + sprintf(output_buffer + strlen(output_buffer), "%s", format_hours(parsed_office_hours[i], (char *) DAY_NAMES[i])); + } + + sprintf(output_buffer + strlen(output_buffer), "%s", (char *) MIDDLE_HTML.data); + sprintf(output_buffer + strlen(output_buffer), "%s", format_seconds(seconds_of_day)); + sprintf(output_buffer + strlen(output_buffer), "%s", (char *) FOOT_HTML.data); + + output_html.data = (unsigned char *) output_buffer; + output_html.len = strlen(output_buffer); + + return output_html; +} + +/* + * Given a tuple of seconds and a day name, outputs an HTML + * string containing the formatted data as a list item + */ + +static char * format_hours(ngx_uint_t * hours, char * day) +{ + + char * output_html; + + output_html = malloc(64 * sizeof(char)); + if (hours[0] == hours[1]) { + sprintf(output_html, "