From 18bde7391efb9c6bd6ea7846891ab5d16276a809 Mon Sep 17 00:00:00 2001
From: David Vazgenovich Shakaryan <dvshakaryan@gmail.com>
Date: Mon, 31 May 2021 06:11:22 -0700
Subject: initial import

A bit messy and missing error handling in some places.
---
 yahoo.c | 106 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 yahoo.c

(limited to 'yahoo.c')

diff --git a/yahoo.c b/yahoo.c
new file mode 100644
index 0000000..7b54922
--- /dev/null
+++ b/yahoo.c
@@ -0,0 +1,106 @@
+#include "assets.h"
+#include "json_curl.h"
+#include "quotes.h"
+#include "yahoo.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <json-c/json.h>
+
+int yahoo_get_quote_symbols(struct asset **assets, int n, char **bufptr)
+{
+	size_t bufsize = 1024;
+	char *buf = malloc(bufsize);
+	if (!buf) return -1;
+	int len = 0;
+
+	for (int i = 0; i < n; ++i) {
+		if (assets[i]->type == CRYPTO) {
+			int c;
+retry:
+			if (strcmp(assets[i]->symbol, "BTC") == 0) {
+				c = snprintf(buf + len, bufsize - len, "%s-USD,",
+					assets[i]->symbol);
+			} else {
+				c = snprintf(buf + len, bufsize - len, "%s-USD,%s-BTC,",
+					assets[i]->symbol, assets[i]->symbol);
+			}
+
+			if (c < 0)
+				continue;
+			if ((unsigned)c >= bufsize - len) {
+				char *tmpbuf = realloc(buf, (bufsize *= 2));
+				if (tmpbuf) {
+					buf = tmpbuf;
+				} else {
+					free(buf);
+					return -1;
+				}
+
+				goto retry;
+			}
+
+			len += c;
+		}
+	}
+
+	buf[--len] = '\0';
+	*bufptr = buf;
+	return len;
+}
+
+static json_object *fetch_quotes(const char *symbols)
+{
+	CURL *curl = curl_easy_init();
+	if (!curl) return NULL;
+
+	char base[] = "https://query1.finance.yahoo.com/v7/finance/quote?symbols=";
+	size_t len_symbols = strlen(symbols);
+	char uri[sizeof(base) + len_symbols];
+	memcpy(uri, base, sizeof(base) - 1);
+	memcpy(uri + sizeof(base) - 1, symbols, len_symbols + 1);
+
+	json_object *json = json_curl_perform(curl, uri);
+	curl_easy_cleanup(curl);
+	return json;
+}
+
+int yahoo_get_quotes(const char *symbols, struct quote ***quotes_ptr)
+{
+	json_object *tmp, *json = fetch_quotes(symbols);
+	json_object_object_get_ex(json, "quoteResponse", &tmp);
+	json_object_object_get_ex(tmp, "result", &tmp);
+
+	int n = json_object_array_length(tmp);
+	struct quote **quotes = calloc(n, sizeof(**quotes));
+	*quotes_ptr = quotes;
+
+	for (int i = 0; i < n; ++i) {
+		struct quote *q = calloc(1, sizeof(*q));
+		json_object *q_tmp, *q_json = json_object_array_get_idx(tmp, i);
+
+		json_object_object_get_ex(q_json, "quoteType", &q_tmp);
+		json_object_object_get_ex(q_json,
+			(strcmp(json_object_get_string(q_tmp), "CRYPTOCURRENCY") == 0) ?
+				"fromCurrency" : "symbol",
+			&q_tmp);
+		q->symbol = strdup(json_object_get_string(q_tmp));
+
+		json_object_object_get_ex(q_json, "currency", &q_tmp);
+		q->currency = strdup(json_object_get_string(q_tmp));
+
+		json_object_object_get_ex(q_json, "regularMarketPrice", &q_tmp);
+		q->price = json_object_get_double(q_tmp);
+
+		json_object_object_get_ex(q_json, "regularMarketChangePercent",
+			&q_tmp);
+		q->change_percent = json_object_get_double(q_tmp);
+
+		quotes[i] = q;
+	}
+
+	json_object_put(json);
+	return n;
+}
-- 
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